Year	Years
1990	70.8
1991	70.7
1992	71.1
1993	71.7
1994	71.8
1995	72
1996	72.4
1997	72.7
1998	73
1999	73.2
2000	73.8
2001	74.3
2002	74.6
2003	74.9
2004	75
2005	75
2006	75
2007	75.1
2008	75.3
2009	75.6
2010	76.1
2011	76.5
2012	76.7
2013	76.9