Year	Percent
1991	0.958
1992	2.553
1993	4.314
1994	3.776
1995	3.8588
1996	3.1609
1997	3.2436
1998	3.1123
2002	1.9317
2003	3.1315
2004	6.1886
2005	0.8994
2006	1.1107
2007	0.8956
2008	2.4069
2009	4.89
2010	5.169
2011	7.1323
2012	4.567
2013	3.0187
2014	2.939
2015	3.1481
2016	2.7187
2017	1.9889