Year	Number of Years
1960-01-01	68.2995365853659
1961-01-01	68.7638536585366
1962-01-01	69.1460975609756
1963-01-01	69.4577073170732
1964-01-01	69.7082195121951
1965-01-01	69.9056341463415
1966-01-01	70.0565365853659
1967-01-01	70.1611219512195
1968-01-01	70.2230731707317
1969-01-01	70.2475609756098
1970-01-01	70.2352195121951
1971-01-01	70.1826341463415
1972-01-01	70.0908536585366
1973-01-01	69.9629268292683
1974-01-01	69.8088536585366
1975-01-01	69.6346341463415
1976-01-01	69.4461707317073
1977-01-01	69.2534390243902
1978-01-01	69.0709024390244
1979-01-01	68.9151219512195
1980-01-01	68.8178292682927
1981-01-01	68.8108292682927
1982-01-01	68.9012439024390
1983-01-01	69.0774878048781
1984-01-01	69.3173414634146
1985-01-01	69.5747804878049
1986-01-01	69.7912439024390
1987-01-01	70.4951219512195
1988-01-01	70.4975609756098
1989-01-01	70.5390243902439
1990-01-01	70.1365853658537
1991-01-01	68.8780487804878
1992-01-01	69.0682926829269
1993-01-01	68.4756097560976
1994-01-01	67.8385365853659
1995-01-01	67.1370731707317
1996-01-01	66.8878048780488
1997-01-01	67.2953658536585
1998-01-01	67.9887804878049
1999-01-01	68.2134146341463
2000-01-01	67.8595121951220
2001-01-01	68.2870731707317
2002-01-01	68.2756097560976
2003-01-01	68.2107317073171
2004-01-01	68.1853658536585
2005-01-01	67.9568292682927
2006-01-01	68.0775609756098
2007-01-01	68.2221951219512
2008-01-01	68.2514634146342
2009-01-01	69.1900000000000
2010-01-01	70.2653658536586
2011-01-01	70.8092682926829
2012-01-01	70.9441463414634
2013-01-01	71.1595121951220
2014-01-01	71.1865853658537
2015-01-01	71.1895121951220
2016-01-01	71.4763414634146