Year	Percent
1990	2.09422
1991	1.95367
1992	2.01123
1993	1.9346
1994	1.88913
1995	2.55183
1996	2.52157
1997	2.51479
1998	2.3813
1999	2.22539
2000	2.14146
2001	2.04507
2002	1.97372
2003	1.87582
2004	1.80846
2005	1.82018
2006	1.79524
2007	1.78149
2008	1.75688
2009	1.32836
2010	1.46407
2011	1.49609
2012	1.43073
2013	1.42164
2014	1.38907
2015	1.39099
2016	1.37607
2017	1.32933
2018	1.30522
2019	1.32008
2020	1.3452