Year	Percent
1990	38.46303
1991	62.53202
1992	64.67323
1993	60.51951
1994	51.79199
1995	46.77659
1996	43.25802
1997	42.62786
1998	36.69543
1999	33.59829
2000	34.40593
2001	23.90119
2002	30.02356
2003	35.82775
2004	35.54198
2005	31.2467
2006	30.69619
2007	30.81723
2008	31.53782
2009	30.43244
2010	32.46445
2011	32.82244
2012	33.2343
2013	33.61804
2014	34.75833
2015	33.22256
2016	34.44694
2017	33.28014
2018	33.96876
2019	32.67115
2020	34.11984