Year	Number of Years
1960-01-01	53.5652078744308
1961-01-01	54.0353931770707
1962-01-01	54.5035696663383
1963-01-01	54.9680332008861
1964-01-01	55.4274572605681
1965-01-01	55.8797193388874
1966-01-01	56.3263085588820
1967-01-01	56.7666720632519
1968-01-01	57.1993764272455
1969-01-01	57.6232086898381
1970-01-01	58.0378497959981
1971-01-01	58.4431740168446
1972-01-01	58.8394984489513
1973-01-01	59.2266665846757
1974-01-01	59.6069375757354
1975-01-01	59.9799184549985
1976-01-01	60.3457871568272
1977-01-01	60.7023499661812
1978-01-01	61.0459373789621
1979-01-01	61.3722331878863
1980-01-01	61.6718431678534
1981-01-01	61.9339489267953
1982-01-01	62.1557633244963
1983-01-01	62.3394853568589
1984-01-01	62.4902415065632
1985-01-01	62.6214412147251
1986-01-01	62.7514897567767
1987-01-01	63.1410916687092
1988-01-01	63.0754398896379
1989-01-01	63.2951221132183
1990-01-01	63.6113533222587
1991-01-01	63.8650939403702
1992-01-01	64.1926434379640
1993-01-01	64.5271109847949
1994-01-01	64.8590624663688
1995-01-01	65.2476849299424
1996-01-01	65.4974606152027
1997-01-01	65.8072247754671
1998-01-01	66.1149253496561
1999-01-01	66.4496473283566
2000-01-01	66.7183349574985
2001-01-01	67.0167829555237
2002-01-01	67.3083482217503
2003-01-01	67.5949245475254
2004-01-01	67.8766502429326
2005-01-01	68.1648513681712
2006-01-01	68.4312175233303
2007-01-01	68.7059342427266
2008-01-01	68.9783492363544
2009-01-01	69.2490268707790
2010-01-01	69.5143525936684
2011-01-01	69.7727485966317
2012-01-01	70.0202020857441
2013-01-01	70.2563982610723
2014-01-01	70.4801476585577
2015-01-01	70.6923836808558
2016-01-01	70.8953763898592