Year	% of total
1992	9.071461488058164
1993	8.225341387030822
1994	8.761581762377162
1995	6.591182832208093
1996	6.524977338987986
1997	5.977008704049819
1998	5.465587932192849
1999	5.709008318998422
2000	5.881030121185013
2001	5.557117848290426
2002	5.944549579995251
2003	5.9844530950473125
2004	6.389602253822848
2005	6.2924991412284035
2006	6.311237091896853
2007	7.198780023870385
2008	6.338434638431625
2009	6.135270178852661
2010	6.312811065107816
2011	6.68424809071452
2012	6.285669844938286
2013	6.658306215814846
2014	7.960878437080199
2015	9.213218614512042
2016	10.31978075098418