Year	Number of Years
1960-01-01	65.6598292682927
1961-01-01	66.0871951219512
1962-01-01	66.4322439024390
1963-01-01	66.7008048780488
1964-01-01	66.9102195121951
1965-01-01	67.0858048780488
1966-01-01	67.2559512195122
1967-01-01	67.4457317073171
1968-01-01	67.6737317073171
1969-01-01	67.9510731707317
1970-01-01	68.2794146341463
1971-01-01	68.6504634146342
1972-01-01	69.0429024390244
1973-01-01	69.4403170731707
1974-01-01	69.8347804878049
1975-01-01	70.2197073170732
1976-01-01	70.5939756097561
1977-01-01	70.9609024390244
1978-01-01	71.3233414634146
1979-01-01	71.6827317073171
1980-01-01	72.1902439024390
1981-01-01	72.5878048780488
1982-01-01	72.6878048780488
1983-01-01	73.0365853658537
1984-01-01	73.2902439024390
1985-01-01	73.8902439024390
1986-01-01	74.2463414634146
1987-01-01	74.5487804878049
1988-01-01	74.6975609756098
1989-01-01	74.9463414634146
1990-01-01	75.2951219512195
1991-01-01	75.6463414634146
1992-01-01	75.9463414634146
1993-01-01	76.0463414634146
1994-01-01	76.1975609756098
1995-01-01	76.2951219512195
1996-01-01	76.5951219512195
1997-01-01	76.8975609756098
1998-01-01	77.3000000000000
1999-01-01	77.5512195121951
2000-01-01	77.9512195121951
2001-01-01	78.2512195121951
2002-01-01	78.5512195121951
2003-01-01	79.0390243902439
2004-01-01	79.4902439024390
2005-01-01	79.9902439024390
2006-01-01	80.1414634146341
2007-01-01	80.4414634146342
2008-01-01	80.7902439024390
2009-01-01	81.2414634146342
2010-01-01	81.5414634146342
2011-01-01	81.7439024390244
2012-01-01	81.9951219512195
2013-01-01	82.2463414634147
2014-01-01	82.4951219512195
2015-01-01	82.7439024390244
2016-01-01	82.7951219512195