Year	Percent
2001	8.45387
2002	5.93504
2003	9.54623
2004	10.51291
2005	15.61774
2006	17.78496
2007	7.97004
2008	9.22223
2009	5.84469
2010	14.16696
2011	27.76535
2012	35.50161
2013	35.7219
2014	30.17985
2015	26.51965
2016	25.25838
2017	27.95716