Year	Percent
1994	31.96109
1995	44.45305
1996	48.2616
1997	48.7144
1998	43.5866
1999	56.47029
2000	75.72713
2001	68.09555
2002	65.97625
2003	69.19507
2004	76.18319
2005	79.13007
2006	76.44942
2007	76.78692
2008	81.72935
2009	62.09806
2010	61.51917
2011	62.94134
2012	63.85005
2013	56.41864
2014	54.53785
2015	41.50125
2016	45.24647
2017	48.7098