Year	% of total
1990	9.25001761215561
1991	9.370757621180859
1992	9.543051421112976
1993	9.608823609911319
1994	9.711513448501373
1995	9.433069455835957
1996	9.300284263664343
1997	9.095306733263921
1998	8.466034321452119
1999	7.9413177907440415
2000	7.506215516769635
2001	7.590010030297512
2002	7.22764718596531
2003	7.324587627800576
2004	7.295559988957462
2005	7.223908265461239
2006	7.655029277497523
2007	7.692270369828901
2008	7.8879303957274365