Year	Percent
1992	3.27
1996	2.94
2001	5.71
2002	5.87
2003	6.02
2004	4.05
2005	3.72
2006	3.39
2007	3.9
2008	3.66
2009	4.29
2010	4.51
2011	4.65
2012	4.21
2013	3.46
2014	3.66
2015	3.35
2016	3.53
2017	3.23
2018	3.59
2019	4.31
2020	6.58