Year	Percent
2000	53.49
2001	56.03
2002	59.88
2003	61.27
2004	56.66
2005	56.25
2006	54.63
2007	52.53
2008	45.59
2009	48.34
2010	51.18
2011	50.25
2012	51.7
2013	51.43
2014	51.29
2015	50.13
2016	53.35
2017	53.2
2018	53.41
2019	57.05
2020	59.36