Year	Number of Years
1960-01-01	53.0018048780488
1961-01-01	53.7367317073171
1962-01-01	54.4850975609756
1963-01-01	55.2473658536585
1964-01-01	56.0235853658537
1965-01-01	56.8232195121951
1966-01-01	57.6581951219512
1967-01-01	58.5265365853659
1968-01-01	59.4182439024390
1969-01-01	60.3163658536585
1970-01-01	62.1634146341463
1971-01-01	62.6121951219512
1972-01-01	63.0097560975610
1973-01-01	63.4073170731707
1974-01-01	63.8048780487805
1975-01-01	64.1536585365854
1976-01-01	64.5024390243902
1977-01-01	64.9000000000000
1978-01-01	65.1975609756098
1979-01-01	65.5463414634146
1980-01-01	66.0463414634146
1981-01-01	66.5463414634146
1982-01-01	67.0951219512195
1983-01-01	67.5463414634146
1984-01-01	68.1951219512195
1985-01-01	68.7951219512195
1986-01-01	69.4463414634146
1987-01-01	69.9975609756098
1988-01-01	70.5487804878049
1989-01-01	71.0487804878049
1990-01-01	71.5975609756098
1991-01-01	72.0463414634146
1992-01-01	72.4975609756098
1993-01-01	72.9975609756098
1994-01-01	73.3975609756098
1995-01-01	73.7000000000000
1996-01-01	74.1512195121951
1997-01-01	74.6024390243903
1998-01-01	75.0048780487805
1999-01-01	75.4097560975610
2000-01-01	75.9097560975610
2001-01-01	76.4121951219512
2002-01-01	76.7658536585366
2003-01-01	77.2146341463415
2004-01-01	77.6658536585366
2005-01-01	78.1682926829268
2006-01-01	78.6682926829268
2007-01-01	79.1195121951220
2008-01-01	79.5170731707317
2009-01-01	79.9682926829268
2010-01-01	80.1170731707317
2011-01-01	80.5682926829269
2012-01-01	80.8195121951220
2013-01-01	81.2707317073171
2014-01-01	81.7219512195122
2015-01-01	82.0243902439024
2016-01-01	82.0243902439024