Year	Percent
1990	1.52782
1991	2.50233
1992	3.48632
1993	3.59323
1994	3.05156
1995	2.44755
1996	2.22338
1997	2.32444
1998	2.24121
1999	1.84249
2000	1.55048
2001	1.52791
2002	1.4492
2003	1.27568
2004	1.09428
2005	0.94051
2006	0.88454
2007	0.63662
2008	0.62885
2009	1.0167
2010	1.02561
2011	0.91818
2012	1.00109
2013	1.14604
2014	1.34507
2015	1.40457
2016	1.29816
2017	1.29645