Year	Percent
1999	1.36
2000	1.68
2001	1.66
2002	1.92
2006	2.1
2007	2.25
2008	1.76
2009	2.01
2011	1.83
2012	1.49
2013	1.58
2014	1.54
2015	1.42
2016	1.58