Haiti is the poorest country in the region, with catastrophic social indicators, ranking it 153th out of 177 countries according to the 2005 index of the Human Development Report of UNDP. Nearly 40% of adult Haitians are illiterate, and the net rate of attendance at primary school does not exceed 49%. Traditionally much below regional and world averages, the humanitarian and health situation in Haiti is currently extremely precarious, due much to current circumstances such as structural deficiencies and the economic situation.