Year	Percent
1992	2.24723
1993	1.8173
1994	1.65407
1995	1.57303
1996	1.53636
1997	1.40137
1998	1.36118
1999	1.2113
2000	1.09317
2001	1.30048
2002	1.38762
2003	1.4038
2004	1.43065
2005	1.4147
2006	1.53803
2007	1.43967
2008	1.49192
2009	1.59005
2010	1.60805
2011	1.29785
2012	1.17252
2013	1.05316
2014	0.97424
2015	0.9305
2016	1.00491
2017	0.99821