Year	Measure
1990	0.692
1991	0.697
1992	0.7
1993	0.703
1994	0.709
1995	0.711
1996	0.717
1997	0.727
1998	0.735
1999	0.738
2000	0.742
2001	0.746
2002	0.747
2003	0.75
2004	0.753
2005	0.756
2006	0.76
2007	0.77
2008	0.774
2009	0.777
2010	0.78
2011	0.784
2012	0.788
2013	0.791
2014	0.794
2015	0.795