Year	Percent
1991	0.02648
1992	0.15199
1993	0.03165
1999	1.12098
2000	0.70844
2001	1.96507
2005	1.87149
2007	1.07038
2008	3.20279
2012	3.71069
2013	3.17758
2014	8.46341
2016	2.32147