Year	Number of Years
1960-01-01	62.3706910812823
1961-01-01	62.8691682619238
1962-01-01	63.3274499603986
1963-01-01	63.7421976228679
1964-01-01	64.1130719686138
1965-01-01	64.4423164070423
1966-01-01	64.7344510178994
1967-01-01	65.0001498572375
1968-01-01	65.2496466160626
1969-01-01	65.4923589356271
1970-01-01	65.7361876885542
1971-01-01	65.9869820558343
1972-01-01	66.2460019087522
1973-01-01	66.5121354249878
1974-01-01	66.7845499875848
1975-01-01	67.0607064732215
1976-01-01	67.3391089806256
1977-01-01	67.6130421276996
1978-01-01	67.8780096723734
1979-01-01	68.1306111337335
1980-01-01	68.3671201511666
1981-01-01	68.5811210261247
1982-01-01	68.7706587447895
1983-01-01	68.9370258053716
1984-01-01	69.0759349784530
1985-01-01	69.1904428076949
1986-01-01	69.2841567620877
1987-01-01	69.3721585488571
1988-01-01	69.4353050126979
1989-01-01	69.5015473976420
1990-01-01	69.5632555095270
1991-01-01	69.6196864470342
1992-01-01	69.7066260367611
1993-01-01	69.7125215464098
1994-01-01	69.7562595758576
1995-01-01	69.8035021513076
1996-01-01	69.8577532468638
1997-01-01	69.9892964515165
1998-01-01	69.9987871553990
1999-01-01	70.0909687808831
2000-01-01	70.2037685439382
2001-01-01	70.3412206530439
2002-01-01	70.5733907007662
2003-01-01	70.6873763948263
2004-01-01	70.8917401236704
2005-01-01	71.1130569511406
2006-01-01	71.3454059082784
2007-01-01	71.5823853563070
2008-01-01	71.8165811915985
2009-01-01	72.0421471122722
2010-01-01	72.2523920321063
2011-01-01	72.4446318371778
2012-01-01	72.6191798536699
2013-01-01	72.7791798911218
2014-01-01	72.9261802778276
2015-01-01	73.0627324010547
2016-01-01	73.1924084965410