Year	Percent
1990	1.18274
1991	1.4384
1992	1.42079
1993	1.57564
1994	1.55376
1995	1.76591
1996	1.90369
1997	1.9784
1998	1.97328
1999	1.92506
2000	1.91045
2001	1.96225
2002	2.38943
2003	2.60319
2004	2.10358
2005	2.10113
2006	2.22542
2007	2.21764
2008	2.20952
2009	2.20253
2010	2.18948
2011	2.16863
2012	2.14965
2013	2.13249
2014	2.11566
2015	2.09881
2016	2.11743
2017	2.13711
2018	2.1014
2019	2.14256
2020	1.92429