Year	Percent
1994	19.76264
1995	20.09052
1996	20.00962
1997	19.43649
1998	19.23264
1999	20.26065
2000	20.15533
2001	21.49934
2002	21.46228
2003	20.59476
2004	21.39699
2005	20.96656
2006	20.8761
2007	20.72706
2008	21.96423
2009	21.07566
2010	21.96871
2011	23.1571
2012	24.54769
2013	25.38761
2014	25.09845
2015	24.50686
2016	24.28908
2017	23.62974