UDI updates statistical information regularly on immigration.  It is good to read the statistics if you plan on immigrating to Norway so you know your chances of approval right from the start.  From UDI.no:

In 2011, 73 per cent of applicants for family reunification were granted residence permits in order to live together with family members in Norway. However, there were big differences between countries as regards how many were granted approval.

Big differences between countries
Nine out of ten applicants from North and South America were granted approval for family immigration. Relatively many applications from people from Africa, the Middle East and South and Central Asia were rejected. The highest percentage of rejections was for applications from countries in East Africa: on average, only 55 per cent of applicants from East Africa were granted family immigration permits.

Illustration: Map of the world showing permit approval percentages

Facts about specific countries and regions

North Africa:
The family member in Norway was usually of Norwegian origin.
Most applicants were female, but the percentage of male applicants was higher than for family cases as a whole.
Morocco was the top applicant country.

Eastern Africa:
The family member in Norway was often a refugee.
Almost 60 per cent of applicants were children with parents in Norway.
The percentage of approvals was higher for children than for adults.
Eritrea, Ethiopia and Somalia were the top applicant countries.

South-East Asia:
The family member in Norway was usually of Norwegian origin.
The majority of applicants were women.
Thailand and the Philippines were the top applicant countries.

Turkey:
Turkey differed from the rest of the Middle East in that it had a far higher percentage of male applicants.
The family member in Norway was usually of Norwegian origin.
The percentage of rejections was higher than elsewhere in the Middle East. There was no difference between men and women in terms of the percentage of rejections.

India:
India stood out from the rest of South and Central Asia, with a rejection rate of only six per cent.
The family member in Norway was often a person with a work permit for a skilled worker.
The majority of applicants were women or children.

Why is the percentage of rejections of applications higher for some countries?
The Norwegian authorities believe it is important that people who want to bring one or more family members to Norway are able to provide for them. The most common reason for rejecting applications for family immigration in 2011 was that the income requirement was not met. The income requirement was tightened after the new Immigration Act came into force in 2010. This was probably part of the reason why rejections of applications in 2010 increased by six percentage points compared with the year before. In 2011, almost all applications were processed in accordance with the new Act, and rejections of applications rose by a further two percentage points, to 30 per cent.

In addition, some issues and grounds for rejection were more relevant to some countries than to others. These reasons for rejection often came in addition to failure to meet the income requirement.

Requirement for four years of work or education
Asylum seekers or refugees, and people who came to Norway as family immigrants and set up families after arriving here must have worked or studied for at least four years for their families to be granted approval for family immigration. This requirement affects more people from countries from which many asylum seekers have come or will continue to come.

Identity documents
It is not possible for many applicants from Africa and parts of Asia to obtain ID documents or other documents that could prove their family relationships. The documents that we receive from certain countries are also often falsified. More applications from these countries were therefore rejected due to doubts about people’s identities or because we believed that it was unlikely that people were related in the way they claimed.

Marriages of convenience
A lot of people in many of the countries with a high percentage of rejections have a strong desire to emigrate, and some are willing to go to extremes in order to settle in the West. Some of those who applied for residence permits with a spouse were not in a real relationship, but simply got married in order to obtain a residence permit for Norway. In 2011, we rejected 120 applications on these grounds. Somalia, Morocco and Turkey were the countries with the highest rejection rate due to marriages of convenience.

Stricter requirements for foster children, full siblings and children over the age of 18
A number of applications were submitted by foster children and full siblings over the age of 18 from countries in East Africa in particular. Many requirements have to be met in order to be granted such a permit, and the majority of these applications were rejected. Some of the applicants from these areas were people over the age of 18 with parents in Norway, and there is very little scope in the regulations to grant permits to these people.

Figure: Family immigration permits by grounds for residence of the person in Norway, 2011

Proposed amendments to the regulations
The new rules for family immigration entailed a tightening of the income requirement. As we have gained experience of how the regulations function in practice, we have also seen that the rules have a number of unintended effects. The UDI has submitted input to the Ministry of Justice on this matter and proposed amending the regulations. Among other things, we have proposed that the income of the person applying for the permit can also be included when we assess whether the income requirement is met.

Key figures for 2011
12 900 family immigration permits
73 per cent were approved
41 per cent of permits were granted to children
77 per cent of permits for adults were granted to women
Most came from Somalia, Thailand, the Philippines, Eritrea and Russia

18.04.2012

(Correct at date of publish)

http://www.udi.no/Norwegian-Directorate-of-Immigration/Annual-Report-2011/Work-and-residence/Who-came-to-be-with-their-families-in-Norway/