Year	% of total
1990	45.39191699790755
1991	44.74710505043698
1992	44.916026373235056
1993	44.28636594451932
1994	44.310505011595545
1995	44.24682924958565
1996	43.937940083629684
1997	44.38759884691021
1998	45.19710109318862
1999	45.95289243169267
2000	45.95772304275622
2001	45.74902280868173
2002	46.880159646636336
2003	47.06785675317304
2004	46.91554814074289
2005	47.51193376421496
2006	47.22124283478483
2007	47.47200387027486
2008	47.29198590946727