Year	% of total
1990	9.07946317112302
1991	9.2761535833082
1992	9.388240447160893
1993	9.577544729165613
1994	9.360145886950729
1995	9.334566141044975
1996	9.412173702728557
1997	9.635735582730373
1998	9.652908646125173
1999	9.575576277275665
2000	9.720859345453436
2001	9.6487857377419
2002	9.505752957233096
2003	9.61786349360759
2004	9.40090058730927
2005	9.397054406743276
2006	9.345382561503769
2007	9.231116391442535
2008	9.350312140886157