Year	Percent
1991	2.99572
1992	2.8956
1993	2.63171
1994	2.88841
1995	2.6784
1996	2.74539
1997	2.65649
1998	2.2378
1999	2.39299
2000	1.90791
2001	1.3796
2002	1.78979
2003	1.7211
2004	2.2188
2005	2.03894
2006	1.95431
2007	1.85603
2008	1.55279
2009	1.48706
2010	1.35199
2011	1.3005
2012	1.172
2013	1.3598
2014	1.2182
2015	1.1765
2016	1.25129
2017	1.1636
2018	0.9943
2019	0.91948