Year	% of total
1990	3.802281368821293
1991	3.9337474120082816
1992	4.785894206549118
1993	4.66321243523316
1994	4.651162790697675
1995	3.89908256880734
1996	3.8461538461538463
1997	3.4261241970021414
1998	3.669724770642202
1999	3.9215686274509802
2000	4.371584699453552
2001	3.8369304556354913
2002	3.87409200968523
2003	4.092071611253197
2004	3.187250996015936
2005	3.3472803347280333
2006	3.7527593818984544
2007	6.97211155378486
2008	11.063829787234042