Year	Number of Years
1960-01-01	71.3134146341463
1961-01-01	71.6448780487805
1962-01-01	71.1960975609756
1963-01-01	71.1875609756098
1964-01-01	72.0778048780488
1965-01-01	72.2017073170732
1966-01-01	72.3356097560976
1967-01-01	72.6365853658537
1968-01-01	72.5902439024390
1969-01-01	72.6126829268293
1970-01-01	73.0202439024390
1971-01-01	73.1307317073171
1972-01-01	73.6443902439025
1973-01-01	73.9409756097561
1974-01-01	74.2870731707317
1975-01-01	74.6656097560976
1976-01-01	74.7853658536585
1977-01-01	75.2380487804878
1978-01-01	75.1873170731707
1979-01-01	75.4660975609756
1980-01-01	75.4592682926830
1981-01-01	75.6931707317073
1982-01-01	76.0339024390244
1983-01-01	76.0312195121951
1984-01-01	76.6085365853659
1985-01-01	76.7336585365854
1986-01-01	76.8990243902439
1987-01-01	77.1975609756098
1988-01-01	77.2265853658537
1989-01-01	77.4212195121951
1990-01-01	77.2424390243902
1991-01-01	77.5146341463415
1992-01-01	77.8060975609756
1993-01-01	78.0853658536586
1994-01-01	78.3500000000000
1995-01-01	78.4170731707317
1996-01-01	78.8960975609756
1997-01-01	79.0795121951220
1998-01-01	79.3243902439025
1999-01-01	79.5804878048780
2000-01-01	79.6804878048781
2001-01-01	80.1804878048781
2002-01-01	80.3853658536585
2003-01-01	80.5365853658537
2004-01-01	81.0878048780488
2005-01-01	81.2365853658537
2006-01-01	81.4902439024390
2007-01-01	81.7414634146342
2008-01-01	81.9926829268293
2009-01-01	82.0439024390244
2010-01-01	82.2463414634147
2011-01-01	82.6951219512195
2012-01-01	82.6975609756098
2013-01-01	82.7975609756098
2014-01-01	83.1975609756098
2015-01-01	82.8975609756098
2016-01-01	82.8975609756098