Year	Percent
2002	4.57
2003	3.49
2004	3.96
2005	3.84
2006	3.39
2007	3.06
2008	3.06
2009	3.07
2010	2.67
2011	2.52
2012	2.35
2013	2.85
2014	2.27
2015	2.52
2016	2.78
2017	2.74
2018	2.59
2019	2.65
2020	6.94