Year	Number of Years
1960-01-01	58.7452195121951
1961-01-01	59.7483658536585
1962-01-01	60.6269024390244
1963-01-01	61.3576585365854
1964-01-01	61.9349512195122
1965-01-01	62.3582926829268
1966-01-01	62.6387073170732
1967-01-01	62.8153170731707
1968-01-01	62.9316829268293
1969-01-01	63.0201951219512
1970-01-01	63.1180487804878
1971-01-01	63.2533414634146
1972-01-01	63.4399512195122
1973-01-01	63.6855365853659
1974-01-01	63.9999756097561
1975-01-01	64.3905365853659
1976-01-01	64.8556341463415
1977-01-01	65.3724390243903
1978-01-01	65.9133170731707
1979-01-01	66.4557804878049
1980-01-01	66.9653902439024
1981-01-01	67.4073902439025
1982-01-01	67.7653658536585
1983-01-01	68.0376097560976
1984-01-01	68.2303658536585
1985-01-01	68.3706829268293
1986-01-01	68.4993658536585
1987-01-01	68.6555121951220
1988-01-01	68.8630243902439
1989-01-01	69.1240243902439
1990-01-01	69.4048780487805
1991-01-01	69.9560975609756
1992-01-01	70.0585365853659
1993-01-01	70.1073170731707
1994-01-01	70.1585365853659
1995-01-01	70.3258536585366
1996-01-01	70.3229268292683
1997-01-01	70.4048780487805
1998-01-01	70.6073170731707
1999-01-01	70.9609756097561
2000-01-01	71.6634146341463
2001-01-01	71.7658536585366
2002-01-01	71.9658536585366
2003-01-01	72.1213008130081
2004-01-01	72.2767479674797
2005-01-01	72.4321951219512
2006-01-01	72.4321951219512
2007-01-01	72.5707317073171
2008-01-01	72.5707317073171
2009-01-01	72.8824390243903
2010-01-01	72.9673170731707
2011-01-01	73.2668292682927
2012-01-01	73.8634146341464
2013-01-01	74.0170731707317
2014-01-01	74.1943902439024
2015-01-01	74.3531707317073
2016-01-01	74.3948780487805