Year	Percent
2000	36.0971
2001	42.7566
2002	38.9599
2003	29.4208
2004	24.9916
2005	23.3521
2006	18.8906
2007	14.4702
2008	13.7206
2009	17.772
2010	23.2119
2011	26.003
2012	29.519
2013	30.2003
2014	23.7975
2015	21.2438
2016	17.4259
2017	13.2503