Year	Percent
2004	9.9
2005	8.35
2006	7.24
2008	5.92
2009	6.55
2010	5.83
2011	5.39
2012	5.57
2013	5.23
2014	5.63
2017	6.39
2018	7.26
2019	7.95
2020	9.17