Year	Percent
2000	22.3884
2001	23.43569
2002	18.76109
2003	15.41393
2004	16.63114
2005	17.7265
2006	23.928
2007	34.75715
2008	41.17661
2009	26.94314
2010	21.76993
2011	19.32887
2012	20.58567
2013	19.60641
2014	20.22135
2015	20.09516
2016	26.09538
2017	29.30941