Year	Percent
1990	0.30593
1991	1.56155
1992	1.59837
1993	1.56542
1994	1.5271
1995	3.33708
1996	3.10879
1997	3.09887
1998	2.84781
1999	2.8
2000	2.66542
2001	2.72448
2002	3.17616
2003	3.07934
2004	3.03304
2005	2.52118
2006	2.6662
2007	2.6464
2008	2.62786
2009	2.73535
2010	2.71953
2011	2.71255
2012	2.70458
2013	2.63446
2014	2.64239
2015	3.08732
2016	3.52408
2017	3.61674
2018	3.73321
2019	3.65793
2020	3.67728