Year	% of total
1990	11.10066683949698
1991	11.369503475455879
1992	11.446334255318302
1993	11.345359349599851
1994	9.220215748955747
1995	8.966710945395686
1996	8.858892642158137
1997	8.560687828679038
1998	7.9321679715572
1999	7.422178062097595
2000	6.91123440785016
2001	6.997904783284443
2002	6.774598465463663
2003	6.900001489668014
2004	6.967611655870064
2005	6.9030884424198655
2006	7.327503241073237
2007	7.304319362568561
2008	7.497354669395351