Year	Number of Years
1960-01-01	40.8189286789489
1961-01-01	41.3419670248563
1962-01-01	41.8868822235923
1963-01-01	42.4591218299577
1964-01-01	43.0582485653045
1965-01-01	43.6768111305133
1966-01-01	44.3027613567215
1967-01-01	44.9205716577223
1968-01-01	45.5176487364495
1969-01-01	46.0882021087020
1970-01-01	46.6304974257038
1971-01-01	47.1483376983004
1972-01-01	47.6488261541572
1973-01-01	48.1349753541665
1974-01-01	48.6052913380824
1975-01-01	49.0550219610637
1976-01-01	49.4786127796287
1977-01-01	49.8754535377414
1978-01-01	50.2512163471567
1979-01-01	50.6153820868479
1980-01-01	50.9796079438726
1981-01-01	51.4631140896132
1982-01-01	51.8529008062845
1983-01-01	52.2564932793921
1984-01-01	52.6692645650867
1985-01-01	53.0811810244822
1986-01-01	53.4814880176336
1987-01-01	53.8616547269173
1988-01-01	54.1994667209427
1989-01-01	54.4983985317896
1990-01-01	54.8538123741812
1991-01-01	55.0653391650758
1992-01-01	55.2404667532874
1993-01-01	55.3924628293949
1994-01-01	55.5318947041137
1995-01-01	55.6691797504884
1996-01-01	55.8121668404003
1997-01-01	55.9684080007648
1998-01-01	56.1365922551355
1999-01-01	56.3191173031556
2000-01-01	56.5582441469102
2001-01-01	56.8378180423926
2002-01-01	57.1618179623127
2003-01-01	57.5257899854720
2004-01-01	57.9233460737886
2005-01-01	58.3453912203636
2006-01-01	58.7829501518037
2007-01-01	59.2233204279086
2008-01-01	59.6543113110306
2009-01-01	60.0683240929108
2010-01-01	60.4610416107455
2011-01-01	60.8353765844025
2012-01-01	61.1985803288185
2013-01-01	61.5547186511445
2014-01-01	61.9026323549994
2015-01-01	62.2405420964978
2016-01-01	62.5694023862998