Year	%
1999	0.97
2001	0.46
2002	0.56
2004	0.47
2005	0.44
2006	0.39
2007	0.52
2009	0.53
2010	0.53
2011	0.79
2012	0.68
2013	0.63
2014	0.79
2015	0.72
2016	0.96
2017	0.83
2018	0.82