Year	% of total
1990	4.998004844389196
1991	5.120881003263075
1992	5.65431668763903
1993	5.171556200127403
1994	4.790634887153503
1995	5.131323006072084
1996	6.577049262079482
1997	8.084425227588088
1998	6.94563066904143
1999	8.090775418667736
2000	10.762100057034473
2001	6.770281725972754
2002	9.029303346353876
2003	7.572801934866661
2004	7.800969235530926
2005	8.91323825137059
2006	10.977323276831997
2007	7.656968732583722
2008	8.017818465320682
2009	7.676273826233881
2010	8.526638650237961
2011	8.808935178628309
2012	8.675317152066533
2013	9.089542955622724
2014	9.940674787616002
2015	10.38142422154436
2016	9.987233644616362