Year	Percent
1990	1.873
1991	1.662
1992	1.055
1993	0.578
1994	1.519
1995	1.535
1996	1.042
1997	1.071
1998	1.349
1999	0.933
2000	0.758
2001	1.176
2002	1.087
2003	0.887
2004	1.542
2005	0.915
2006	0.8234
2007	0.639
2008	0.8993
2009	1.4326
2010	1.7347
2011	1.1586
2012	1.1066
2013	1.3397
2014	2.4353
2015	2.9446
2016	3.1162
2017	2.4682