Year	Percent
2001	33.23906
2002	35.45637
2003	29.54646
2004	23.66884
2005	20.39872
2006	25.93813
2007	23.57996
2008	17.17771
2009	18.40699
2010	15.39835
2011	17.18857
2012	15.00662
2013	12.31984
2014	12.96429
2015	13.42388
2016	18.32144