Year	Percent
1990	1.06
1991	1.08
1992	1.16
1993	1.19
1994	1.86
1996	2.13
1997	2
1998	2.69
1999	3.15
2000	2.88
2001	2.94
2002	3.08
2003	3.06
2004	3.32
2005	3.87
2006	3.82
2007	5.07
2008	5.03
2009	3.72
2010	3.47
2011	2.84
2012	2.47
2013	2.29
2014	2.01
2015	2.42
2016	2.42
2017	2.06
2018	2.52
2019	2.11
2020	2.81