Year	% of total
1992	47.25701603042281
1993	57.65091988605523
1994	58.155906827461266
1995	58.799266536254
1996	58.27102272042547
1997	62.55341968642688
1998	49.26290492158673
1999	49.47908575590635
2000	55.78257824374555
2001	49.8720682666754
2002	47.488954328043846
2003	47.1052019563848
2004	52.133989086767286
2005	43.39096768702429
2006	45.21526242408572
2007	51.195022219941805
2008	51.36095646205352
2009	53.597033101005394
2010	56.528518382185325
2011	65.17183257609194
2012	71.34445435174628
2013	61.224576896101105
2014	76.12366095817791
2015	75.83215158213963
2016	73.03802074583808