Year	% of total
1990	0
1991	0
1992	0
1993	0
1994	0
1995	5.466642690163639
1996	37.39942066301899
1997	26.654503234367226
1998	25.66628977548054
1999	36.34773482595767
2000	33.65223229271568
2001	34.58659704090514
2002	41.34807030259105
2003	36.320668969278316
2004	36.50082918739635
2005	42.99509260725028
2006	44.4369634741626
2007	43.28585961342828
2008	42.65164644714038
2009	43.97813436783636
2010	38.36080727160684
2011	34.293405114401075
2012	28.758088601294173
2013	30.609597924773023
2014	31.806451612903224