Year	% of total
1990	12.287606262499418
1991	12.227236815992576
1992	11.680674185261495
1993	11.51087619138464
1994	11.33136855391154
1995	10.354775246261404
1996	9.403406760749807
1997	8.660812048327053
1998	7.761769008909948
1999	7.229883130034359
2000	9.92684376263242
2001	9.897435826159816
2002	9.860729581798592
2003	10.169206802888695
2004	9.89840907666651
2005	10.003704413922746
2006	9.749996893759395
2007	9.94536070408775
2008	10.10300573388592