Year	Percent
2000	9.69226
2001	10.58049
2002	13.0069
2003	14.25826
2004	16.36636
2005	17.5122
2006	19.23729
2007	20.40913
2008	22.66582
2009	24.53201
2010	26.46806
2011	31.29165
2012	32.37302
2013	32.36222
2014	34.48959
2015	34.46878
2016	35.01947
2017	31.63884