Year	Percent
1992	0.50953
1993	0.50612
1994	0.23868
1995	0.48458
1996	0.52115
1997	0.95332
1998	1.08392
1999	1.00038
2000	0.82192
2001	0.731
2002	0.71411
2003	0.69858
2004	0.71552
2005	0.85349
2006	0.80273
2007	0.79086
2008	0.77814
2009	0.76452
2010	0.74117
2011	0.56278
2012	0.55457
2013	0.54719
2014	0.54007
2015	0.5337
2016	0.52697
2017	0.51999
2018	0.51413
2019	0.50853
2020	0.50854