Year	Number of Years
1960-01-01	71.1331707317073
1961-01-01	71.3460975609756
1962-01-01	71.3670731707317
1963-01-01	71.3807317073171
1964-01-01	71.7763414634146
1965-01-01	71.8721951219512
1966-01-01	72.0043902439024
1967-01-01	72.2078048780488
1968-01-01	72.3534146341463
1969-01-01	72.5014634146341
1970-01-01	72.7004878048781
1971-01-01	73.0292682926829
1972-01-01	72.9339024390244
1973-01-01	73.1626829268293
1974-01-01	73.2375609756098
1975-01-01	73.5217073170732
1976-01-01	73.8560975609756
1977-01-01	74.2156097560976
1978-01-01	74.5297560975610
1979-01-01	74.8663414634146
1980-01-01	75.0780487804878
1981-01-01	75.4785365853659
1982-01-01	75.6804878048781
1983-01-01	76.0363414634146
1984-01-01	76.3175609756098
1985-01-01	76.3034146341464
1986-01-01	76.4400000000000
1987-01-01	76.7395121951220
1988-01-01	76.8092682926829
1989-01-01	77.0656097560976
1990-01-01	77.3770731707317
1991-01-01	77.5534146341464
1992-01-01	77.3207317073171
1993-01-01	77.6851219512195
1994-01-01	77.8619512195122
1995-01-01	77.9775609756098
1996-01-01	78.2304878048781
1997-01-01	78.4804878048781
1998-01-01	78.6624390243902
1999-01-01	78.8829268292683
2000-01-01	79.2365853658537
2001-01-01	79.4878048780488
2002-01-01	79.5902439024390
2003-01-01	79.8390243902439
2004-01-01	80.1414634146341
2005-01-01	80.2926829268293
2006-01-01	80.2926829268293
2007-01-01	80.5439024390244
2008-01-01	80.6951219512195
2009-01-01	80.9463414634146
2010-01-01	81.1975609756098
2011-01-01	81.4487804878049
2012-01-01	81.5835121951220
2013-01-01	81.7720487804878
2014-01-01	81.9530487804878
2015-01-01	82.1290243902439
2016-01-01	82.3005121951220