But is it true? Not so.
In fact, the "17 year" statistic comes from a 2004 internal UNHCR report, and it was accompanied by many caveats which have been lost along the way. The statistic does not refer to camps, since the overwhelming majority of refugees live outside camps. It is limited to situations of five years or more, so it is an average duration of the longest situations, not of all situations. Most importantly, it refers to the duration of situations, not to the time people have stayed in exile.
Take the situation of Somali refugees in Kenya. Refugees started to arrive massively around 1993, about 23 years ago. Their number now stands at 418,000. But can we say that all 418,000 have been in exile for 23 years?
In fact, . As we see in Figure 1, numbers vary every year: they reflect political and military developments in the country of origin. In fact, a large part of the current total could not have arrived before 2008, i.e. about 6 or 7 years ago.
Figure 1 Number of Somali refugees in Kenya (UNHCR data)
Along these lines, and using data published by UNHCR as of end-2015, we re-calculated the earliest date at which various cohorts of refugees could have arrived in each situation (see working paper). We then aggregated all situations into a single "global refugee population" and calculated global averages and median durations.
So what are the results?
When we look at the "global refugee population" (See Figure 2), we can now distinguish several distinct episodes of displacement.
Figure 2 Number of refugees by year of exile
There is a large cohort of about 8.9 million "recent refugees," who arrived over the last four years. This includes about 4.8 million Syrians, as well as people fleeing from South Sudan (0.7 million), Afghanistan (0.3 million), Ukraine (0.3 million), the Central African Republic (0.3 million), and Pakistan (0.2 million).
Another large cohort, of about 2.2 million, has spent between 5 and 9 years in exile. It includes refugees from Afghanistan (0.5 million), the bulk of the current Somali refugees (0.4 million), and people fleeing from Colombia (0.3 million) and Myanmar (0.2 million).
About 2 million people have been in exile between 10 and 34 years. This includes years during which numbers are relatively low, and two episodes where they are higher, around 14 years ago, with the arrival of about 0.2 million Sudanese refugees, and around 24 and 25 years ago, with the arrival of about 0.1 million Somalis and 0.1 million Eritreans.
Lastly, a large group of refugees has been in exile for 35 to 37 years: these 2.2 million refugees include mainly Afghans, but also about 0.3 million ethnic Chinese who fled into China during the 1979 war with Vietnam. Finally, there are few very protracted situations, up to 55 years, including mainly Western Sahara.
We can now turn to average durations. As of end-2015, the median duration of exile stands at 4 years, i.e. half of the refugees worldwide have spent 4 years or less in exile. The median has fluctuated widely since the end of the Cold War, in 1991, between 4 and 14 years, and it is now at a historical low. By contrast, the mean duration stands at 10.3 years, and has been relatively stable since the late 1990s, between 10 and 15 years.
But this leads to another important finding: trends can be counter-intuitive. In fact, a decline in the average duration of exile is typically not an improvement, but rather the consequence of a degradation of the global situation. The averages increase in years when there are relatively few new refugees, and they drop when large numbers of people flow in, for example in 1993-1994 (with conflicts in Former Yugoslavia and Rwanda), in 1997-1999 (with conflicts in DRC and other parts of Africa), after 2003 (with conflict in Iraq, Somalia, and Sudan), and since 2013 (with the conflict in the Syrian Arab Republic).
We also looked at the number of people who have spent more than five years in exile. As of end-2015, this number stands at 6.6 million, and it has been remarkably stable since 1991, at 5 to 7 million throughout most of the period. For this group, however, the average duration of exile increases over time – largely because of the unresolved situation of Afghan refugees which pushes averages up. It is now well over 20 years.
This short analysis of UNHCR data shows that . It is important to ensure that this debate is informed by evidence, which can help provide a more nuanced perspective of a complex issue.