Year	Percent
2000	36.81499
2001	38.42345
2002	35.35612
2003	30.61125
2004	42.02205
2005	43.54912
2006	40.56152
2007	43.00303
2008	39.51975
2009	34.33087
2010	37.04441
2011	42.34886
2012	43.6725
2013	41.34235
2014	40.14373
2015	42.11807
2016	40.46094
2017	41.01535