Year	Percent
1990	3.18237
1991	3.23919
1992	3.11791
1993	2.99857
1994	2.9916
1995	2.97771
1996	2.97459
1997	2.86191
1998	2.76886
1999	2.72223
2000	2.56361
2001	2.48963
2002	2.37138
2003	2.35796
2004	2.34703
2005	2.0336
2006	1.94584
2007	1.89629
2008	1.87462
2009	1.80274
2010	1.77551
2011	1.88343
2012	1.97075
2013	2.14459
2014	1.99786
2015	2.06524
2016	1.92837
2017	1.97268
2018	1.94542
2019	1.9073
2020	2.00819
2021	1.90018
2022	1.82094