Year	Percent
1986	38.06344
1987	40.55749
1988	46.29702
1989	42.06742
1990	38.73674
1991	40.48913
1992	33.93859
1993	29.86995
1994	27.42783
1995	27.18269
1996	27.75883
1997	25.77171
1998	25.78078
1999	25.43444
2000	24.53458
2001	23.24105
2002	23.02944
2003	22.54244
2004	21.8077
2005	19.29998
2006	18.72679
2007	18.6551
2008	20.41314
2009	19.16846
2010	15.37509
2011	16.25915
2012	16.19951
2013	15.21561
2014	14.88035
2015	14.47473
2016	13.81826
2017	12.92988
2018	12.30667
2019	11.78453
2020	12.6554
2021	12.56037
2022	11.87711