Year	Number of Years
1960-01-01	73.0056097560976
1961-01-01	73.4743902439024
1962-01-01	73.3504878048781
1963-01-01	73.5553658536585
1964-01-01	73.7331707317073
1965-01-01	73.8617073170732
1966-01-01	74.0785365853659
1967-01-01	74.1224390243903
1968-01-01	73.9729268292683
1969-01-01	74.0848780487805
1970-01-01	74.6492682926829
1971-01-01	74.6239024390244
1972-01-01	74.7180487804878
1973-01-01	74.8673170731707
1974-01-01	74.9804878048781
1975-01-01	74.9846341463415
1976-01-01	74.9692682926829
1977-01-01	75.3797560975610
1978-01-01	75.4690243902439
1979-01-01	75.5241463414634
1980-01-01	75.7409756097561
1981-01-01	76.0260975609756
1982-01-01	76.3273170731707
1983-01-01	76.5517073170732
1984-01-01	76.8158536585366
1985-01-01	76.6678048780488
1986-01-01	76.9312195121951
1987-01-01	77.0921951219512
1988-01-01	76.9792682926829
1989-01-01	77.7268292682927
1990-01-01	77.5368292682927
1991-01-01	77.6668292682927
1992-01-01	77.9987804878049
1993-01-01	78.0604878048781
1994-01-01	78.6502439024390
1995-01-01	78.7404878048781
1996-01-01	78.9590243902439
1997-01-01	79.1975609756098
1998-01-01	79.3390243902439
1999-01-01	79.4414634146342
2000-01-01	79.6439024390244
2001-01-01	79.7951219512195
2002-01-01	79.8463414634146
2003-01-01	80.0951219512195
2004-01-01	80.4975609756098
2005-01-01	80.5463414634146
2006-01-01	80.7487804878049
2007-01-01	80.9000000000000
2008-01-01	81.1000000000000
2009-01-01	81.3512195121951
2010-01-01	81.4512195121951
2011-01-01	81.8024390243903
2012-01-01	81.7048780487805
2013-01-01	81.9560975609756
2014-01-01	82.2536585365854
2015-01-01	82.2048780487805
2016-01-01	82.2048780487805