Year	Percent
1990	3.41029
1991	3.82698
1992	3.74199
1993	3.68028
1994	3.57739
1995	2.98696
1996	3.05071
1997	3.02042
1998	3.07393
1999	3.03989
2000	3.00641
2001	2.96
2002	2.91789
2003	2.91658
2004	2.87665
2005	2.84805
2006	2.81161
2007	2.78089
2008	2.76057
2009	2.62841
2010	2.59444
2011	2.54919
2012	2.51053
2013	2.47612
2014	2.30944
2015	2.28334
2016	2.26091
2017	2.23636
2018	2.13229
2019	2.12782
2020	1.98971