Year	Percent
1990	2.91943
1991	3.66482
1992	3.14617
1993	3.05157
1994	2.83971
1995	2.99484
1996	2.93324
1997	2.84443
1998	2.7623
1999	2.67408
2000	3.06521
2001	2.96184
2002	2.81955
2003	2.70508
2004	2.60088
2005	2.52372
2006	2.66965
2007	2.51894
2008	2.39962
2009	2.39628
2010	2.2554
2011	2.14394
2012	2.04493
2013	1.99037
2014	1.9379
2015	1.87107
2016	1.8006
2017	1.80949
2018	1.7351
2019	1.62732
2020	1.76304