Year	% of total
1990	12.2739350080991
1991	12.274743818903735
1992	11.858390262967104
1993	11.83035399857883
1994	11.777774200253399
1995	11.087740010131157
1996	10.257191961674422
1997	9.586526783960398
1998	8.775638506161828
1999	8.382018301014513
2000	10.755080274891824
2001	10.76532191284342
2002	10.819619716093245
2003	11.161179196310334
2004	10.8894174246169
2005	11.05877795691565
2006	10.922540506102647
2007	11.223512526619372
2008	11.619125689253735