Year	% of total
1990	9.822817760315086
1991	10.143100049926703
1992	10.4655488063559
1993	10.668846080952
1994	9.05266269100541
1995	8.978269646583678
1996	8.87391944341696
1997	8.723015809923565
1998	8.191931815465049
1999	7.8867212040668
2000	7.508506563257141
2001	7.642378471030236
2002	7.392048226988116
2003	7.529724982560883
2004	7.585797430057479
2005	7.482916158896257
2006	7.82384635701338
2007	7.774032054675878
2008	7.883227687526997