Year	Number of Years
1960-01-01	69.8682926829268
1961-01-01	70.1170731707317
1962-01-01	70.3146341463415
1963-01-01	70.5146341463415
1964-01-01	70.6634146341463
1965-01-01	70.8121951219512
1966-01-01	70.9609756097561
1967-01-01	71.1609756097561
1968-01-01	71.3097560975610
1969-01-01	71.4585365853659
1970-01-01	71.6585365853659
1971-01-01	71.9073170731707
1972-01-01	72.1073170731707
1973-01-01	72.3560975609756
1974-01-01	72.6048780487805
1975-01-01	72.8536585365854
1976-01-01	73.1024390243903
1977-01-01	73.3512195121951
1978-01-01	73.6024390243903
1979-01-01	73.8512195121951
1980-01-01	74.0512195121951
1981-01-01	74.3000000000000
1982-01-01	74.5000000000000
1983-01-01	74.8000000000000
1984-01-01	75.0000000000000
1985-01-01	75.3000000000000
1986-01-01	75.6000000000000
1987-01-01	75.8000000000000
1988-01-01	76.1000000000000
1989-01-01	76.3487804878049
1990-01-01	76.6000000000000
1991-01-01	76.8487804878049
1992-01-01	77.1000000000000
1993-01-01	77.3000000000000
1994-01-01	77.6487804878049
1995-01-01	77.7512195121951
1996-01-01	77.9536585365854
1997-01-01	78.3048780487805
1998-01-01	78.6048780487805
1999-01-01	78.7560975609756
2000-01-01	79.0560975609756
2001-01-01	79.1585365853659
2002-01-01	79.2609756097561
2003-01-01	79.1146341463415
2004-01-01	80.1634146341463
2005-01-01	80.1634146341463
2006-01-01	80.8121951219512
2007-01-01	81.1121951219512
2008-01-01	81.2146341463415
2009-01-01	81.4146341463415
2010-01-01	81.6634146341463
2011-01-01	82.1146341463415
2012-01-01	81.9682926829268
2013-01-01	82.2195121951220
2014-01-01	82.6707317073171
2015-01-01	82.2731707317073
2016-01-01	82.2731707317073