Year	Percent
2002	15.17
2003	18.13
2004	19.74
2005	18.79
2006	17.1
2007	14.46
2008	11.22
2009	15.41
2010	17.83
2011	14.89
2012	13.1
2013	12.21
2014	9.31
2015	12.34
2016	10.97
2017	11.8
2018	9.6
2019	10.41
2020	10.86