Year	Percent
1983	0.5762
1988	0.8945
1990	1.3834
1991	1.566
1992	0.8247
1995	1.2256
1996	1.6245
1997	1.2188
1998	1.3911
2005	3.5987
2006	2.019
2007	1.0861
2009	0.7277
2010	1.2746
2011	4.5808
2012	4.7858
2013	5.7192
2014	6.6961
2015	6.2684
2016	10.4071
2017	11.6308