Year	Number of Years
1960-01-01	69.7707317073171
1961-01-01	70.2707317073171
1962-01-01	70.1195121951220
1963-01-01	69.9170731707317
1964-01-01	70.1658536585366
1965-01-01	70.2146341463415
1966-01-01	70.2121951219512
1967-01-01	70.5609756097561
1968-01-01	69.9512195121951
1969-01-01	70.5073170731708
1970-01-01	70.8073170731707
1971-01-01	71.1073170731707
1972-01-01	71.1560975609756
1973-01-01	71.3560975609756
1974-01-01	71.9560975609756
1975-01-01	72.6048780487805
1976-01-01	72.8560975609756
1977-01-01	73.2560975609756
1978-01-01	73.3560975609756
1979-01-01	73.8048780487805
1980-01-01	73.6097560975610
1981-01-01	74.0097560975610
1982-01-01	74.3609756097561
1983-01-01	74.4634146341463
1984-01-01	74.5634146341464
1985-01-01	74.5634146341464
1986-01-01	74.6146341463415
1987-01-01	74.7658536585366
1988-01-01	74.7658536585366
1989-01-01	75.0170731707317
1990-01-01	75.2146341463415
1991-01-01	75.3658536585366
1992-01-01	75.6170731707317
1993-01-01	75.4195121951220
1994-01-01	75.6195121951220
1995-01-01	75.6219512195122
1996-01-01	76.0268292682927
1997-01-01	76.4292682926829
1998-01-01	76.5804878048781
1999-01-01	76.5829268292683
2000-01-01	76.6365853658537
2001-01-01	76.8365853658537
2002-01-01	76.9365853658537
2003-01-01	77.0365853658537
2004-01-01	77.4878048780488
2005-01-01	77.4878048780488
2006-01-01	77.6878048780488
2007-01-01	77.9878048780488
2008-01-01	78.0390243902439
2009-01-01	78.3902439024390
2010-01-01	78.5414634146342
2011-01-01	78.6414634146341
2012-01-01	78.7414634146342
2013-01-01	78.7414634146342
2014-01-01	78.8414634146341
2015-01-01	78.6902439024390
2016-01-01	78.6902439024390