Year	Number of Years
1960-01-01	69.3100243902439
1961-01-01	69.5080000000000
1962-01-01	69.6915365853659
1963-01-01	69.8596097560976
1964-01-01	70.0137073170732
1965-01-01	70.1518292682927
1966-01-01	70.2714146341463
1967-01-01	70.3740000000000
1968-01-01	70.4650975609756
1969-01-01	70.5506829268293
1970-01-01	70.6397804878049
1971-01-01	70.7428780487805
1972-01-01	70.8670000000000
1973-01-01	71.0166829268293
1974-01-01	71.1954146341463
1975-01-01	71.4017317073171
1976-01-01	71.6341463414634
1977-01-01	71.8836829268293
1978-01-01	72.1432926829268
1979-01-01	72.4085365853659
1980-01-01	72.6779024390244
1981-01-01	72.9503902439024
1982-01-01	73.2270000000000
1983-01-01	73.5051951219512
1984-01-01	73.7829268292683
1985-01-01	74.0546341463415
1986-01-01	74.3137317073171
1987-01-01	74.5596829268293
1988-01-01	74.7924878048781
1989-01-01	75.0131463414634
1990-01-01	75.2277560975610
1991-01-01	75.3195121951220
1992-01-01	75.8195121951220
1993-01-01	75.8707317073171
1994-01-01	76.2707317073171
1995-01-01	76.4219512195122
1996-01-01	76.6731707317073
1997-01-01	77.0731707317073
1998-01-01	77.4756097560976
1999-01-01	77.7268292682927
2000-01-01	77.9268292682927
2001-01-01	78.3292682926829
2002-01-01	78.2292682926829
2003-01-01	78.3804878048781
2004-01-01	78.6804878048781
2005-01-01	78.9317073170732
2006-01-01	79.1317073170732
2007-01-01	79.5341463414634
2008-01-01	79.7365853658537
2009-01-01	79.8365853658537
2010-01-01	79.9878048780488
2011-01-01	80.4365853658537
2012-01-01	80.5390243902439
2013-01-01	80.4902439024390
2014-01-01	81.0902439024390
2015-01-01	80.6414634146341
2016-01-01	80.6414634146341