Chart 2: Evolution of measles vaccination coverage Source: Health statistical yearbooks 188. According to the results of INSEED surveys conducted between 1996 and 2015, there has been progress in vaccination coverage for children over the age of one year, although the trends are different from those indicated in health statistical yearbooks. Thus, between 1996 and 2004, the coverage rate remained constant at 23%. It was from 2010 onwards that a significant improvement was noted from 36% to 57% in 2014-2015. Chart 3: Evolution of the measles vaccination coverage rate Source: 1996-1997 DHS, 2004 DHS, 2010 MICS and 2014-2015 DHS-MICS surveys Page 45 sur 87