Year	% of total
1990	7.0650205349513175
1991	7.351722549253143
1992	7.4242322266269545
1993	7.6837052326902
1994	7.8141414369691065
1995	7.909437008556567
1996	7.621272346754694
1997	8.15900356162822
1998	8.27110634513836
1999	8.356005095210696
2000	7.919392197328126
2001	7.801032817756887
2002	8.113248122536312
2003	10.079824983336877
2004	9.916556458435107
2005	9.827911854360194
2006	8.907615591333446
2007	11.090713393579072
2008	9.568071853240525