Year	Percent
1992	1.2128
1993	1.21353
1994	1.29166
1995	3.16547
1996	2.71802
1997	2.58481
1998	2.08926
1999	2.00815
2000	2.04053
2001	2.05613
2002	2.0714
2003	1.94957
2004	1.96884
2005	1.99237
2006	2.00301
2007	2.05099
2008	2.02761
2009	1.97733
2010	1.95295
2011	1.91682
2012	1.87989
2013	1.85061
2014	1.8085
2015	1.77124
2016	1.7228
2017	1.69368
2018	1.66378
2019	1.65162
2020	1.58748