Year	Percent
1990	2.68647
1991	2.50264
1992	1.9357
1993	1.70471
1994	1.27044
1995	1.12327
1996	1.10099
1997	1.05105
1998	1.02355
1999	0.95503
2000	0.88984
2001	0.91293
2002	0.89804
2003	0.92676
2004	0.80253
2005	0.79971
2006	0.86081
2007	0.82473
2008	0.81635
2009	0.82302
2010	0.73021
2011	0.69821
2012	0.62513
2013	0.75574
2014	0.75518
2015	0.72852
2016	0.67638
2017	0.62914
2018	0.61236
2019	0.50054
2020	0.46447