Year	Number of Years
1960-01-01	39.5148600822972
1961-01-01	39.9290486269794
1962-01-01	40.3453441388035
1963-01-01	40.7721475971956
1964-01-01	41.2154914590699
1965-01-01	41.6774811678202
1966-01-01	42.1558423512625
1967-01-01	42.6423214156958
1968-01-01	43.1299362804096
1969-01-01	43.6138629999692
1970-01-01	44.0918687596568
1971-01-01	44.5638150964943
1972-01-01	45.0303790020569
1973-01-01	45.4891908602416
1974-01-01	45.9379691944547
1975-01-01	46.3720104282372
1976-01-01	46.7873359653547
1977-01-01	47.1840834347005
1978-01-01	47.5653830977437
1979-01-01	47.9352411390812
1980-01-01	48.2997359462267
1981-01-01	48.6643876923438
1982-01-01	49.0305681422342
1983-01-01	49.3954848056351
1984-01-01	49.7526773115215
1985-01-01	50.0880313055971
1986-01-01	50.3841931252025
1987-01-01	50.6295867000752
1988-01-01	50.8200264992821
1989-01-01	50.9655506926681
1990-01-01	51.0846342417241
1991-01-01	51.2015391378360
1992-01-01	51.3365265955975
1993-01-01	51.4969262498653
1994-01-01	51.6774005656579
1995-01-01	51.8801441222564
1996-01-01	52.1161786159361
1997-01-01	52.3967452886324
1998-01-01	52.7296661077268
1999-01-01	53.1204936951600
2000-01-01	53.5737272044774
2001-01-01	54.0922040588460
2002-01-01	54.6703809248671
2003-01-01	55.2997825999615
2004-01-01	55.9706107053076
2005-01-01	56.6693443096383
2006-01-01	57.3825408106057
2007-01-01	58.0936442114421
2008-01-01	58.7845295838932
2009-01-01	59.4399012362780
2010-01-01	60.0500259762707
2011-01-01	60.6128024328675
2012-01-01	61.1370118051692
2013-01-01	61.6298426973199
2014-01-01	62.0930431666333
2015-01-01	62.5278654126279
2016-01-01	62.9354735127997