Year	Percent
1992	4.48
1995	6.8
1996	5.17
1997	4.51
1998	4.93
1999	5.85
2000	6.87
2001	6.26
2002	7.31
2003	6.2
2004	6.37
2005	6.36
2006	6.44
2007	5.6
2008	4.99
2009	6.06
2010	6.25
2011	6.3
2012	6.05
2013	6.37
2014	6.12
2015	6.16
2016	5.3
2017	4.21
2018	3.57
2019	3.19
2020	4.41