Year	Number of Years
1960-01-01	73.3926829268293
1961-01-01	73.6526829268293
1962-01-01	73.3239024390244
1963-01-01	73.3370731707317
1964-01-01	73.7041463414634
1965-01-01	73.5687804878049
1966-01-01	73.5129268292683
1967-01-01	73.8041463414634
1968-01-01	73.6126829268293
1969-01-01	73.5395121951220
1970-01-01	73.5856097560976
1971-01-01	73.8095121951220
1972-01-01	73.7270731707317
1973-01-01	74.1439024390244
1974-01-01	74.5368292682927
1975-01-01	74.4987804878049
1976-01-01	74.6470731707317
1977-01-01	75.2214634146342
1978-01-01	75.1451219512195
1979-01-01	75.6060975609756
1980-01-01	75.7431707317073
1981-01-01	75.9343902439025
1982-01-01	75.9885365853659
1983-01-01	76.1641463414634
1984-01-01	76.2331707317073
1985-01-01	76.2846341463415
1986-01-01	76.2704878048781
1987-01-01	76.7051219512195
1988-01-01	76.8902439024390
1989-01-01	76.7341463414634
1990-01-01	76.8780487804878
1991-01-01	77.0000000000000
1992-01-01	77.2170731707317
1993-01-01	76.9165853658537
1994-01-01	77.3751219512195
1995-01-01	77.4046341463415
1996-01-01	77.4356097560976
1997-01-01	77.7943902439024
1998-01-01	77.8829268292683
1999-01-01	77.8365853658537
2000-01-01	77.9878048780488
2001-01-01	78.1902439024390
2002-01-01	78.2926829268293
2003-01-01	78.4926829268293
2004-01-01	79.0951219512195
2005-01-01	79.3463414634146
2006-01-01	79.6975609756098
2007-01-01	80.0975609756098
2008-01-01	80.2512195121951
2009-01-01	80.5487804878049
2010-01-01	80.7024390243902
2011-01-01	81.2048780487805
2012-01-01	81.1048780487805
2013-01-01	81.3048780487805
2014-01-01	81.7073170731707
2015-01-01	81.5097560975610
2016-01-01	81.5097560975610