Year	Percent
1991	0.6
1995	1.1
1996	1.1
1998	0.4
1999	0.5
2000	1
2001	0.9
2002	0.9
2003	0.7
2004	1.1
2005	1.2
2006	1.7
2007	1.9
2008	1.7
2009	1.8
2010	1.9
2011	2.1
2012	2.2
2013	2.1
2014	2.2
2015	2.4
2016	2.3