Year	Percent
1990	0.79389
1991	0.77469
1992	0.9525
1993	0.92457
1994	0.94178
1995	1.46161
1996	1.42563
1997	1.38819
1998	1.35797
1999	1.32608
2000	1.38311
2001	1.43743
2002	1.40828
2003	1.58166
2004	1.74563
2005	1.72789
2006	2.04568
2007	2.11374
2008	2.05791
2009	2.07825
2010	1.99668
2011	1.93172
2012	1.87128
2013	1.9145
2014	1.87974
2015	1.94313
2016	1.92133
2017	1.88415
2018	1.85005
2019	1.82857
2020	1.7166