Year	Percent
1990	6.80105
1991	6.79265
1992	4.01054
1993	4.04013
1994	3.21466
1995	2.83136
1996	2.69158
1997	1.77584
1998	1.76619
1999	2.0229
2000	1.84703
2001	1.57005
2002	1.55764
2003	1.54169
2004	1.57545
2005	1.57062
2006	1.54548
2007	1.52802
2008	1.51613
2009	1.46658
2010	1.47802
2011	1.45816
2012	1.45
2013	1.44177
2014	1.43556
2015	1.42604
2016	1.42171
2017	1.4262
2018	1.42178
2019	1.42121
2020	1.53898