Year	Years
1990	76
1991	76.2
1992	76.4
1993	76.5
1994	76.7
1995	76.9
1996	77.1
1997	77.3
1998	77.5
1999	77.6
2000	77.8
2001	78
2002	78.2
2003	78.5
2004	78.9
2005	79.2
2006	79.3
2007	79.4
2008	79.4
2009	79.6
2010	79.8
2011	80
2012	80.1
2013	80.2