Year	Years
1990	74.7
1991	74.7
1992	74.8
1993	74.8
1994	74.8
1995	74.9
1996	75.2
1997	75.3
1998	75.4
1999	75.6
2000	75.9
2001	76.2
2002	76.6
2003	76.8
2004	76.9
2005	77.1
2006	77.4
2007	77.6
2008	77.8
2009	77.9
2010	78
2011	78.1
2012	78.2
2013	78.3