Year	% of total
1990	9.541925136951733
1991	9.48207377612224
1992	9.358877257482291
1993	9.517566962171198
1994	9.283495330296038
1995	8.777124487356746
1996	8.586698272020948
1997	9.08884823822909
1998	8.945748516402695
1999	8.67190165547585
2000	8.790145779145819
2001	8.754211894715631
2002	8.640835750893638
2003	9.092345076996518
2004	8.623427853388426
2005	8.896098824172938
2006	8.675446290887573
2007	8.870361869528802
2008	9.143456550169983