Year	Number of Years
1960-01-01	73.5497560975610
1961-01-01	73.5504878048781
1962-01-01	73.4480487804878
1963-01-01	73.0775609756098
1964-01-01	73.5958536585366
1965-01-01	73.7231707317073
1966-01-01	73.9953658536585
1967-01-01	74.0665853658537
1968-01-01	73.9419512195122
1969-01-01	73.6634146341463
1970-01-01	74.0880487804878
1971-01-01	74.1792682926829
1972-01-01	74.3446341463415
1973-01-01	74.4421951219512
1974-01-01	74.7536585365854
1975-01-01	74.8175609756098
1976-01-01	75.0395121951220
1977-01-01	75.3868292682927
1978-01-01	75.4185365853659
1979-01-01	75.4139024390244
1980-01-01	75.6717073170732
1981-01-01	75.8690243902439
1982-01-01	76.0109756097561
1983-01-01	76.0668292682927
1984-01-01	76.2243902439024
1985-01-01	75.9168292682927
1986-01-01	76.2412195121951
1987-01-01	76.0817073170732
1988-01-01	76.2204878048781
1989-01-01	76.5004878048780
1990-01-01	76.5373170731707
1991-01-01	76.9807317073171
1992-01-01	77.1843902439025
1993-01-01	77.1517073170732
1994-01-01	77.6897560975610
1995-01-01	77.7365853658537
1996-01-01	78.1504878048781
1997-01-01	78.1426829268293
1998-01-01	78.3292682926829
1999-01-01	78.2829268292683
2000-01-01	78.6341463414634
2001-01-01	78.7853658536585
2002-01-01	78.9878048780488
2003-01-01	79.3902439024390
2004-01-01	79.8414634146342
2005-01-01	80.0414634146342
2006-01-01	80.3439024390244
2007-01-01	80.3951219512195
2008-01-01	80.5926829268293
2009-01-01	80.7951219512195
2010-01-01	80.9975609756098
2011-01-01	81.2951219512195
2012-01-01	81.4512195121951
2013-01-01	81.7512195121951
2014-01-01	82.1000000000000
2015-01-01	82.3048780487805
2016-01-01	82.5097560975610