Year	Percent
1990	0.47126
1991	0.46717
1992	0.4958
1993	0.53935
1994	0.70987
1995	0.55545
1996	0.85436
1997	0.87047
1998	1.6895
1999	1.71514
2000	1.67778
2001	1.82859
2002	1.77237
2003	1.87935
2004	2.60478
2005	2.53436
2007	1.46755
2008	1.4072
2009	1.33503
2010	1.27634
2011	1.24111
2012	1.20619
2013	1.17414
2014	1.14444
2015	0.9059
2016	1.12102
2017	0.66751
2018	1.06288
2019	1.02197
2020	0.60663