Year	Percent
2002	2.61
2003	3.09
2004	3.38
2005	3.42
2006	3.45
2007	2.73
2008	2.37
2009	3.33
2010	3.42
2011	3.25
2012	2.55
2013	2.59
2014	1.64
2015	2.33
2016	1.86
2017	2.11
2018	2.64
2019	3.92
2020	2.87