Year	Percent
1990	1.39967
1991	1.35776
1992	1.34707
1993	1.30738
1994	0.98137
1995	1.58421
1996	1.54114
1997	1.33864
1998	1.06027
1999	1.02239
2000	1.28454
2001	1.19027
2002	1.15628
2003	1.12397
2004	1.03942
2005	1.01679
2006	0.72536
2007	0.70979
2008	0.69475
2009	0.66491
2010	0.65121
2011	0.77095
2012	0.70729
2013	0.74443
2014	0.7317
2015	0.71482
2016	0.6961
2017	0.67559
2018	0.66513
2019	0.66346
2020	0.67147