Year	Percent
1994	14.54296
1995	17.12258
1996	16.01361
1997	17.29613
1998	18.05398
1999	17.59693
2000	20.51651
2001	15.38327
2002	13.4372
2003	12.98135
2004	13.78546
2005	14.96958
2006	14.99562
2007	19.36685
2008	17.45711
2009	15.59258
2010	15.34034
2011	17.1938
2012	16.58865
2013	16.60628
2014	17.08374
2015	18.44946
2016	17.73464
2017	18.57278