Annual Number of Years
1960-01-01 46.6316434808415
1961-01-01 47.2212607698649
1962-01-01 47.8076039450309
1963-01-01 48.3941859013758
1964-01-01 48.9834233572063
1965-01-01 49.5709643829269
1966-01-01 50.1496425730307
1967-01-01 50.7140141761342
1968-01-01 51.2652490551905
1969-01-01 51.8080930116037
1970-01-01 52.3601623420991
1971-01-01 52.9440837276684
1972-01-01 53.5708076100299
1973-01-01 54.2372211688273
1974-01-01 54.9318527344860
1975-01-01 55.6174065971932
1976-01-01 56.2454847085152
1977-01-01 56.7863286073223
1978-01-01 57.2315468222993
1979-01-01 57.5960478026480
1980-01-01 57.9249961283021
1981-01-01 58.2842900014332
1982-01-01 58.7334423049359
1983-01-01 59.3098078446960
1984-01-01 60.0206907402034
1985-01-01 60.8500340861286
1986-01-01 61.7582406268182
1987-01-01 62.6819278069047
1988-01-01 63.5659064273248
1989-01-01 64.3816304393292
1990-01-01 65.1328157457343
1991-01-01 65.7599397085628
1992-01-01 66.3106009000628
1993-01-01 66.8042996078802
1994-01-01 67.2492208066518
1995-01-01 67.6527677731247
1996-01-01 68.0211238284279
1997-01-01 68.3604948315203
1998-01-01 68.6769919257675
1999-01-01 68.9767906973164
2000-01-01 69.2655244373117
2001-01-01 69.5464290602042
2002-01-01 69.8198464824074
2003-01-01 70.0861225293243
2004-01-01 70.3479018041243
2005-01-01 70.6050542444019
2006-01-01 70.8568065283290
2007-01-01 71.0988525700465
2008-01-01 71.3286692527803
2009-01-01 71.5462921103223
2010-01-01 71.7548050000704
2011-01-01 71.9593278782990
2012-01-01 72.1641462021744
2013-01-01 72.3714973554048
2014-01-01 72.5788298451069
2015-01-01 72.7857363593388
2016-01-01 72.9919202205410