Annual Number of Years
1960-01-01 69.7965121951220
1961-01-01 69.9782682926829
1962-01-01 70.1340731707317
1963-01-01 70.2729268292683
1964-01-01 70.4012926829268
1965-01-01 70.5231463414634
1966-01-01 70.6384390243903
1967-01-01 70.7451463414634
1968-01-01 70.8442926829268
1969-01-01 70.9378780487805
1970-01-01 71.0314390243903
1971-01-01 71.1285365853659
1972-01-01 71.2322439024390
1973-01-01 71.3455609756098
1974-01-01 71.4720243902439
1975-01-01 71.6166097560976
1976-01-01 71.7827804878049
1977-01-01 71.9690000000000
1978-01-01 72.1737317073171
1979-01-01 72.3934634146342
1980-01-01 72.6232439024390
1981-01-01 72.8560975609756
1982-01-01 73.0880731707317
1983-01-01 73.3136829268293
1984-01-01 73.5314634146342
1985-01-01 73.7423658536585
1986-01-01 73.9514146341463
1987-01-01 74.1625365853659
1988-01-01 74.3777073170732
1989-01-01 74.5959024390244
1990-01-01 74.8090975609756
1991-01-01 75.0052682926829
1992-01-01 75.1809512195122
1993-01-01 75.3361219512195
1994-01-01 75.4768048780488
1995-01-01 75.6175609756098
1996-01-01 75.8317073170732
1997-01-01 75.9853658536586
1998-01-01 76.1804878048781
1999-01-01 76.0829268292683
2000-01-01 76.5365853658537
2001-01-01 77.1341463414634
2002-01-01 77.6341463414634
2003-01-01 78.1390243902439
2004-01-01 78.5390243902439
2005-01-01 78.9439024390244
2006-01-01 79.2414634146342
2007-01-01 79.6414634146341
2008-01-01 80.0951219512195
2009-01-01 80.1902439024390
2010-01-01 80.7439024390244
2011-01-01 80.7463414634146
2012-01-01 80.8463414634146
2013-01-01 81.0000000000000
2014-01-01 81.3487804878049
2015-01-01 81.4536585365854
2016-01-01 81.6073170731707