Year	Percent
2002	19.79407
2003	10.11502
2004	7.24586
2005	11.94307
2006	9.42024
2007	10.23643
2008	19.02234
2009	19.15136
2010	15.76359
2011	13.50862
2012	18.50151
2013	19.26426
2015	19.79151