Year	Percent
2001	1.04
2002	1.01
2003	0.97
2004	1.17
2005	0.98
2006	1.13
2007	1
2008	0.77
2009	0.82
2010	0.83
2011	0.8
2012	0.46
2013	0.39
2015	0.12