Year	Percent
1991	3.48189
1992	3.39839
1993	3.34619
1994	3.2573
1995	3.17
1996	2.9354
1997	2.9421
1998	2.7805
1999	2.8652
2000	2.6375
2001	2.6159
2002	2.487
2003	2.4246
2004	2.3551
2005	2.3737
2006	2.2679
2007	2.2585
2008	1.7848
2009	1.6824
2010	1.6474
2011	1.6446
2012	1.5606
2013	1.4465
2014	1.4285
2015	1.3939
2016	1.3082
2017	1.2768
2018	1.2495
2019	1.20468