Year	Percent
1990	3.62421
1991	3.61893
1992	3.61941
1993	3.70268
1994	3.87615
1995	3.54726
1996	3.48364
1997	3.67491
1998	2.21645
1999	2.16377
2000	2.18957
2001	2.3602
2002	1.89036
2003	1.74346
2004	1.78686
2005	1.54869
2006	1.72713
2007	1.272
2008	1.38763
2009	1.41665
2010	1.34474
2011	1.36823
2012	1.64444
2013	1.71329
2014	1.77246
2015	1.91334
2016	1.92671
2017	2.0119
2019	1.78614