Year	Number of Years
1960-01-01	73.4231707317073
1961-01-01	73.5034146341464
1962-01-01	73.7219512195122
1963-01-01	73.0429268292683
1964-01-01	73.5417073170732
1965-01-01	73.8687804878049
1966-01-01	73.3004878048781
1967-01-01	73.7831707317073
1968-01-01	74.0058536585366
1969-01-01	73.7763414634147
1970-01-01	73.9339024390244
1971-01-01	73.5704878048781
1972-01-01	74.4558536585366
1973-01-01	74.4509756097561
1974-01-01	74.5117073170732
1975-01-01	75.5787804878049
1976-01-01	76.9721951219512
1977-01-01	76.3736585365854
1978-01-01	76.6492682926829
1979-01-01	76.7731707317073
1980-01-01	76.8465853658537
1981-01-01	76.5214634146341
1982-01-01	77.0378048780488
1983-01-01	76.8456097560976
1984-01-01	77.5765853658537
1985-01-01	77.6024390243903
1986-01-01	77.9907317073171
1987-01-01	77.3390243902439
1988-01-01	77.0829268292683
1989-01-01	78.1409756097561
1990-01-01	78.0363414634146
1991-01-01	77.9919512195122
1992-01-01	78.7602439024390
1993-01-01	78.9346341463415
1994-01-01	79.2470731707317
1995-01-01	77.9843902439024
1996-01-01	78.7778048780488
1997-01-01	78.8853658536585
1998-01-01	79.6024390243903
1999-01-01	79.3512195121951
2000-01-01	79.6536585365854
2001-01-01	80.6902439024390
2002-01-01	80.5024390243903
2003-01-01	80.9634146341464
2004-01-01	80.9975609756098
2005-01-01	81.5024390243902
2006-01-01	81.1585365853659
2007-01-01	81.4536585365854
2008-01-01	81.6097560975610
2009-01-01	81.7512195121951
2010-01-01	81.8975609756098
2011-01-01	82.3585365853659
2012-01-01	82.9170731707317
2013-01-01	82.0609756097561
2014-01-01	82.8609756097561
2015-01-01	82.4682926829268
2016-01-01	82.4682926829268