Year	% of total
1990	49.63518227223045
1991	49.60948168123956
1992	49.921724353142736
1993	49.688989960810204
1994	49.930654023754656
1995	50.12671009544457
1996	49.73830274161129
1997	49.198038296637975
1998	49.19416204540221
1999	49.089977263689754
2000	48.54238254721588
2001	48.12875591969779
2002	47.94042838449723
2003	47.29623439127013
2004	47.09727156157852
2005	47.08810727561975
2006	46.463919515865925
2007	45.944307826677715
2008	45.46888155012899