Year	Percent
2000	41.73
2001	43.13337
2002	43.2579
2003	42.78126
2004	42.82418
2005	47.12098
2006	46.27015
2007	43.15925
2008	43.23355
2009	43.03215
2010	44.52893
2011	48.46178
2012	50.56982
2013	51.18508
2014	51.34189
2015	53.29144
2016	52.06068
2017	50.88639