Year	Percent
1990	1.97892
1991	1.90166
1992	1.83559
1993	1.76373
1994	1.69709
1995	2.12148
1996	2.06942
1997	3.28191
1998	3.16382
1999	3.4845
2000	3.41899
2001	3.33706
2002	3.39784
2003	3.23043
2004	3.26248
2005	3.21701
2006	3.3143
2007	3.26028
2008	3.21068
2009	3.16722
2010	2.92831
2011	2.86596
2012	2.80861
2013	2.68957
2014	2.81222
2015	2.70884
2016	2.66143
2017	2.62696
2018	2.5938
2019	2.5572
2020	2.74924