Year	Years
1990	76.4
1991	76.5
1992	76.6
1993	76.9
1994	77.2
1995	77.5
1996	77.8
1997	78.1
1998	78.3
1999	78.6
2000	78.8
2001	78.9
2002	79.1
2003	79.4
2004	79.7
2005	80
2006	80.2
2007	80.6
2008	80.9
2009	81.2
2010	81.5
2011	81.8
2012	82.1
2013	82.2