Year	Percent
1994	22.6162
1995	22.23425
1996	22.30642
1997	22.27216
1998	23.68351
1999	21.22946
2000	19.96541
2001	20.43071
2002	19.11541
2003	18.31214
2004	14.21336
2005	14.38721
2006	14.62049
2007	15.06073
2008	16.48175
2009	15.68105
2010	14.0735
2011	14.81774
2012	15.28409
2013	17.83845
2014	17.59019
2015	15.38183
2016	15.38183
2017	12.00645