Year	Percent
1987	1
1994	0.9
1998	1.3
1999	0.7
2000	0.9
2003	1.1
2004	1
2005	1.1
2006	1.3
2007	1.1
2008	1.3
2009	1.4
2010	1.4
2011	1.5
2012	1.5
2013	1.6
2014	1.7
2015	1.6
2016	1.6