Year	Percent
1985	32.66332
1986	33.05228
1987	30.80645
1988	31.68605
1989	32.02899
1990	33.33333
1991	36.09467
1992	29.52087
1993	20.97983
1994	19.63812
1995	36.69169
1996	36.03593
1997	32.01183
1998	25.10131
1999	25.38864
2000	25.12453
2001	23.80841
2002	22.2321
2003	24.19456
2004	19.22235
2005	21.19169
2006	21.45107
2007	19.43473
2008	19.86728
2009	18.552
2010	19.58668
2011	23.83551
2012	23.32682
2013	21.32089
2014	23.77378
2015	21.59057
2016	20.85698
2017	20.2833
2018	19.77196
2019	20.86707
2020	22.69043
2021	22.44908