Annual Number of Years
1960-01-01 67.6660975609756
1961-01-01 68.3100000000000
1962-01-01 68.5948780487805
1963-01-01 69.6580487804878
1964-01-01 70.1324390243903
1965-01-01 70.2019512195122
1966-01-01 70.9865853658537
1967-01-01 71.2765853658537
1968-01-01 71.6112195121951
1969-01-01 71.8387804878049
1970-01-01 71.9502439024390
1971-01-01 72.8829268292683
1972-01-01 73.5065853658537
1973-01-01 73.7575609756097
1974-01-01 74.3939024390244
1975-01-01 75.0573170731707
1976-01-01 75.4568292682927
1977-01-01 75.8982926829268
1978-01-01 76.0382926829268
1979-01-01 76.3375609756098
1980-01-01 76.0917073170732
1981-01-01 76.4143902439025
1982-01-01 76.9229268292683
1983-01-01 76.9614634146342
1984-01-01 77.3653658536585
1985-01-01 77.6504878048780
1986-01-01 78.0646341463415
1987-01-01 78.4836585365854
1988-01-01 78.3992682926829
1989-01-01 78.8180487804878
1990-01-01 78.8368292682927
1991-01-01 79.1007317073171
1992-01-01 79.1539024390244
1993-01-01 79.2936585365854
1994-01-01 79.6870731707317
1995-01-01 79.5363414634147
1996-01-01 80.2002439024390
1997-01-01 80.4241463414634
1998-01-01 80.5014634146342
1999-01-01 80.5707317073171
2000-01-01 81.0760975609756
2001-01-01 81.4170731707317
2002-01-01 81.5634146341463
2003-01-01 81.7600000000000
2004-01-01 82.0302439024390
2005-01-01 81.9251219512195
2006-01-01 82.3219512195122
2007-01-01 82.5070731707317
2008-01-01 82.5875609756098
2009-01-01 82.9314634146342
2010-01-01 82.8426829268293
2011-01-01 82.5912195121951
2012-01-01 83.0960975609756
2013-01-01 83.3319512195122
2014-01-01 83.5878048780488
2015-01-01 83.7939024390244
2016-01-01 83.9848780487805