Year	Percent
1990	1.71629
1991	1.70054
1992	1.7098
1993	1.69019
1994	1.64466
1995	2.36485
1996	2.21632
1997	2.10261
1998	2.03861
1999	1.96034
2000	2.02618
2001	1.96464
2002	1.90646
2003	1.85103
2004	1.81789
2005	1.7798
2006	1.7471
2007	1.69445
2008	1.64685
2009	1.58646
2010	1.56998
2011	1.53706
2012	1.49798
2013	1.4626
2014	1.41838
2015	1.38457
2016	1.37453
2017	1.36165
2018	1.35694
2019	1.31113
2020	1.29463