Year	Percent
1986	23.78706
1987	26.20016
1988	23.27276
1989	23.57007
1990	24.68895
1991	18.26091
1992	16.55594
1993	17.39453
1994	20.16844
1995	18.51875
1996	17.39941
1997	20.11736
1998	21.1641
1999	21.49547
2000	20.98183
2001	21.74068
2002	21.63161
2003	20.77997
2004	23.3142
2005	22.28106
2006	15.58457
2007	16.81971
2008	15.98001
2009	16.36062
2010	17.48495
2011	16.06975
2012	16.83167
2013	17.54527
2014	17.52382
2015	18.47824
2016	17.58995
2017	20.52847
2018	22.94001
2019	26.42728
2020	26.1379
2021	27.31992
2022	27.31992