Year	Number of Years
1960-01-01	66.2248536585366
1961-01-01	66.4879756097561
1962-01-01	66.7410975609756
1963-01-01	66.9962195121951
1964-01-01	67.2603658536585
1965-01-01	67.5405121951220
1966-01-01	67.8351219512195
1967-01-01	68.1381951219512
1968-01-01	68.4427317073171
1969-01-01	68.7482195121951
1970-01-01	69.0511951219512
1971-01-01	69.3511463414634
1972-01-01	69.6466097560976
1973-01-01	69.9355853658537
1974-01-01	70.2175853658537
1975-01-01	70.4900731707317
1976-01-01	70.7505365853659
1977-01-01	70.9999268292683
1978-01-01	71.2392439024390
1979-01-01	71.4709756097561
1980-01-01	71.7001219512195
1981-01-01	71.9307073170732
1982-01-01	72.1662439024390
1983-01-01	72.4102439024390
1984-01-01	72.6622195121951
1985-01-01	72.9221707317073
1986-01-01	73.1870487804878
1987-01-01	73.4538536585366
1988-01-01	73.7175853658537
1989-01-01	73.9782439024390
1990-01-01	74.2358536585366
1991-01-01	74.4919512195122
1992-01-01	74.7470487804878
1993-01-01	75.0026585365854
1994-01-01	75.2572926829268
1995-01-01	75.5099268292683
1996-01-01	75.7590243902439
1997-01-01	76.0025365853659
1998-01-01	76.2369756097561
1999-01-01	76.4618536585366
2000-01-01	76.6195121951220
2001-01-01	77.6731707317073
2002-01-01	77.6219512195122
2003-01-01	77.5731707317073
2004-01-01	77.8731707317073
2005-01-01	77.4219512195122
2006-01-01	78.4756097560976
2007-01-01	76.8609756097561
2008-01-01	77.2634146341463
2009-01-01	77.6146341463415
2010-01-01	77.9658536585366
2011-01-01	78.4170731707317
2012-01-01	78.6682926829268
2013-01-01	78.8682926829268
2014-01-01	78.9682926829268
2015-01-01	79.1682926829268
2016-01-01	79.2682926829268