Year	Percent
1992	1.53881
1993	1.8221
1994	1.6477
1995	1.45805
1996	1.27018
1997	1.10901
1998	0.85584
1999	0.82995
2000	0.74816
2001	0.63674
2002	0.59246
2003	0.55908
2004	0.61223
2005	0.57738
2006	0.74164
2007	0.7446
2008	0.79484
2009	1.16869
2010	1.42368
2011	1.5501
2012	1.65419
2013	1.59399
2014	1.25521
2015	1.01464
2016	0.83403
2017	0.73351