Year	Percent
1992	5.6
1993	8.44
1994	6.97
1995	5.42
1996	5.87
1997	5.58
1998	6.13
1999	2.73
2000	3.12
2001	2.84
2002	2.94
2003	2.85
2004	2.87
2005	3.87
2006	3.97
2007	4.38
2008	5.12
2009	6.49
2010	7.9
2011	9.18
2012	8.4
2013	8.05
2014	6.37
2015	5.77
2016	4.4
2017	3.59
2018	2.58
2019	2.23
2020	2.99