The length of appointment is an important tool to describe changes in the UN workforce. Ten years ago professional staff tended to remain at the UN for a longer period (only 38% left the organizations in the first 5 years of service and about 50% after serving 10 years) in 2007 almost 50% of professional staff left the organization in the first five years of service and more than 70% decided to leave in the first ten years.

Number of staffLess than 5 years5-10 years10-15 years15-20 years20-25 years25 years and over
20071257655002859215212261248
1997716639012527219314561247

Source: Personnel statistics 1997 - 2007