Annual Number of Years
1960-01-01 56.0544135925826
1961-01-01 56.5364887196770
1962-01-01 57.0007149577625
1963-01-01 57.4479722436981
1964-01-01 57.8793734569607
1965-01-01 58.3002643764214
1966-01-01 58.7164449674454
1967-01-01 59.1321181244669
1968-01-01 59.5515541022400
1969-01-01 59.9755220796666
1970-01-01 60.4019911967897
1971-01-01 60.8279182550800
1972-01-01 61.2465544055346
1973-01-01 61.6541948583062
1974-01-01 62.0495604612892
1975-01-01 62.4332258252206
1976-01-01 62.8089423812347
1977-01-01 63.1805142788486
1978-01-01 63.5517973162914
1979-01-01 63.9238859023422
1980-01-01 64.2960722500190
1981-01-01 64.6662616776245
1982-01-01 65.0327272489950
1983-01-01 65.3906851145191
1984-01-01 65.7438283759256
1985-01-01 66.0907719197104
1986-01-01 66.4321230677501
1987-01-01 66.7699387069684
1988-01-01 67.1055647131615
1989-01-01 67.4427012916922
1990-01-01 67.7861914138206
1991-01-01 68.1406390682420
1992-01-01 68.5082053146936
1993-01-01 68.8859866689222
1994-01-01 69.2743833842720
1995-01-01 69.6679787914515
1996-01-01 70.0615832969396
1997-01-01 70.4494594665082
1998-01-01 70.8239105739132
1999-01-01 71.1829326838039
2000-01-01 71.5298314829906
2001-01-01 71.8501708564076
2002-01-01 72.1556211331992
2003-01-01 72.4432786850988
2004-01-01 72.7178230269670
2005-01-01 72.9825373380929
2006-01-01 73.2403874519773
2007-01-01 73.4914220767815
2008-01-01 73.7347319890022
2009-01-01 73.9804575428207
2010-01-01 74.2220028650889
2011-01-01 74.4590556400681
2012-01-01 74.6884191733679
2013-01-01 74.9110522560835
2014-01-01 75.1271940228282
2015-01-01 75.3354843581914
2016-01-01 75.5400506153496