Year	% of total
1990	49.113019843771376
1991	48.93367875381575
1992	48.66311269961268
1993	47.93519823031892
1994	47.92723980497786
1995	47.7018500067457
1996	47.855458355154155
1997	48.14498992380489
1998	48.28989522276743
1999	48.26607928680135
2000	48.371944090245464
2001	48.56805321247342
2002	47.831074997559995
2003	47.52874146170941
2004	47.369690505676395
2005	47.10962267692342
2006	47.41078226365668
2007	47.15521371661795
2008	48.23079599246982