Year	Number of Years
1960-01-01	39.5745923289298
1961-01-01	40.0093200642896
1962-01-01	40.4364929513784
1963-01-01	40.8547463212236
1964-01-01	41.2643779943996
1965-01-01	41.6673833553120
1966-01-01	42.0672801617187
1967-01-01	42.4674861479064
1968-01-01	42.8705612435176
1969-01-01	43.2767440481637
1970-01-01	43.6866204110467
1971-01-01	44.0996747825174
1972-01-01	44.5128780484762
1973-01-01	44.9215579611752
1974-01-01	45.3230031706981
1975-01-01	45.7118005635601
1976-01-01	46.0830076449390
1977-01-01	46.4361444166829
1978-01-01	46.7726047103793
1979-01-01	47.0946344446403
1980-01-01	47.4073376296467
1981-01-01	47.7163305042426
1982-01-01	48.0242351174177
1983-01-01	48.3298548047762
1984-01-01	48.6283181294624
1985-01-01	48.9062485139819
1986-01-01	49.1462698078047
1987-01-01	49.3374522769759
1988-01-01	49.4773492501937
1989-01-01	49.5784061527639
1990-01-01	49.6632764891295
1991-01-01	49.7609479692103
1992-01-01	49.8924230696314
1993-01-01	50.0638778972896
1994-01-01	50.2667207194717
1995-01-01	50.4963900393599
1996-01-01	50.7550212474960
1997-01-01	51.0479766094823
1998-01-01	51.3811814760269
1999-01-01	51.7620900479982
2000-01-01	52.2011921624773
2001-01-01	52.7097428879370
2002-01-01	53.2893725907225
2003-01-01	53.9343625718801
2004-01-01	54.6332961865880
2005-01-01	55.3705458777032
2006-01-01	56.1291451021547
2007-01-01	56.8885578323868
2008-01-01	57.6298179232254
2009-01-01	58.3381248482459
2010-01-01	59.0015934153104
2011-01-01	59.6145896162271
2012-01-01	60.1833247904443
2013-01-01	60.7132108809683
2014-01-01	61.2047933454608
2015-01-01	61.6599734531366
2016-01-01	62.0817538874784