Year	Number of Years
1960-01-01	40.2357261875548
1961-01-01	40.7106147912187
1962-01-01	41.1947721472741
1963-01-01	41.6868984747927
1964-01-01	42.1810129461460
1965-01-01	42.6567528991085
1966-01-01	43.0892705495047
1967-01-01	43.4624665318651
1968-01-01	43.7695858475568
1969-01-01	44.0162405846723
1970-01-01	44.2233138287275
1971-01-01	44.4224067439498
1972-01-01	44.6462694196184
1973-01-01	44.9195269846938
1974-01-01	45.2562445543443
1975-01-01	45.6632131599328
1976-01-01	46.1371782765384
1977-01-01	46.6533265954462
1978-01-01	47.1809758559507
1979-01-01	47.6949380477136
1980-01-01	48.1799894954183
1981-01-01	48.6337183849688
1982-01-01	49.0670428854878
1983-01-01	49.4862579235407
1984-01-01	49.8914620698693
1985-01-01	50.2741571128765
1986-01-01	50.6232656200868
1987-01-01	50.9357454952627
1988-01-01	51.2141093221599
1989-01-01	51.4693263198252
1990-01-01	51.7209722022559
1991-01-01	51.9931100742219
1992-01-01	52.3003510589747
1993-01-01	52.6458226676240
1994-01-01	53.0226691634282
1995-01-01	53.4244667702266
1996-01-01	53.8482383950003
1997-01-01	54.2914854321821
1998-01-01	54.7519572260649
1999-01-01	55.2300304489573
2000-01-01	55.7294130398820
2001-01-01	56.2571021273505
2002-01-01	56.8177628119103
2003-01-01	57.4102877448907
2004-01-01	58.0291932082017
2005-01-01	58.6664864871333
2006-01-01	59.3139136878378
2007-01-01	59.9596192673043
2008-01-01	60.5919570539325
2009-01-01	61.2019289409397
2010-01-01	61.7791981413611
2011-01-01	62.3168705571668
2012-01-01	62.8159874488870
2013-01-01	63.2776503796616
2014-01-01	63.7017169572641
2015-01-01	64.0895866544639
2016-01-01	64.4451978135642