Year	Percent
1991	2.21
1992	3.21
1993	4.34
1994	4.18
1995	4.1
1996	2.58
1997	2.98
1998	2.29
1999	1.71
2000	1.34
2001	1.33
2002	2.48
2003	2.12
2004	1.94
2005	1.65
2006	1.76
2007	1.31
2008	1.93
2009	6.14
2010	6.34
2011	5.65
2012	4.55
2013	4.65
2014	4.32
2015	3.14
2016	2.48
2017	1.85
2018	2.08
2019	2.91
2020	5.27