Year	Percent
1990	2.1012
1991	2.00217
1992	2.14713
1993	2.16755
1994	2.17062
1995	1.71749
1996	1.64246
1997	1.55452
1998	1.53189
1999	1.4096
2000	0.82226
2001	1.06556
2002	1.65175
2003	1.44509
2004	1.99678
2005	1.9513
2006	1.27665
2007	1.20776
2008	1.25034
2009	1.76831
2010	1.57648
2011	1.24009
2012	1.08518
2013	1.17568
2014	1.23609
2015	1.36606
2016	1.45357
2017	1.57227