Year	% of total
1992	4.82355754857997
1993	3.9655562461155993
1994	3.2314559386973176
1995	1.927640586797066
1996	2.5369182389937106
1997	0.5314492753623188
1998	1.5432264529058117
1999	1.3791814159292035
2000	1.230020964360587
2001	1.5626420454545455
2002	1.858277027027027
2003	3.5973734177215193
2004	5.1142136498516315
2005	4.237806603773585
2006	3.823042553191489
2007	6.773854351687389
2008	9.394793388429752
2009	9.069626334519572
2010	15.026428571428571
2011	16.535245398773004
2012	16.422447844228095
2013	15.38830357142857
2014	13.421133412042503
2015	11.758315217391306
2016	10.488