Year	% of total
1990	12.287606262499414
1991	12.227236815992574
1992	11.680674185261495
1993	11.51087619138464
1994	11.331368553911538
1995	10.354775246261404
1996	9.403406760749808
1997	8.660812048327053
1998	7.761769008909946
1999	7.229883130034358
2000	9.92684376263242
2001	9.897435826159816
2002	9.860729581798592
2003	10.169206802888695
2004	9.898409076666512
2005	10.003704413922746
2006	9.749996893759395
2007	9.94536070408775
2008	10.10300573388592