Year	Number of Years
1960-01-01	66.9616829268293
1961-01-01	67.5487560975610
1962-01-01	68.1059756097561
1963-01-01	68.6258536585366
1964-01-01	69.1043658536585
1965-01-01	69.5428780487805
1966-01-01	69.9462195121951
1967-01-01	70.3257804878049
1968-01-01	70.6905365853659
1969-01-01	71.0445609756098
1970-01-01	71.3865121951220
1971-01-01	71.4585365853659
1972-01-01	71.4560975609756
1973-01-01	72.1097560975610
1974-01-01	72.6121951219512
1975-01-01	73.3682926829268
1976-01-01	72.8195121951220
1977-01-01	73.3195121951220
1978-01-01	73.5756097560976
1979-01-01	73.6731707317073
1980-01-01	74.6731707317073
1981-01-01	75.3243902439025
1982-01-01	75.4292682926829
1983-01-01	75.2756097560976
1984-01-01	76.0292682926829
1985-01-01	76.4341463414634
1986-01-01	76.6853658536585
1987-01-01	76.8829268292683
1988-01-01	77.0829268292683
1989-01-01	77.0292682926829
1990-01-01	77.3804878048781
1991-01-01	77.8829268292683
1992-01-01	77.6780487804878
1993-01-01	78.0317073170732
1994-01-01	78.5292682926829
1995-01-01	78.6829268292683
1996-01-01	79.6268292682927
1997-01-01	80.1268292682927
1998-01-01	80.1317073170732
1999-01-01	80.3829268292683
2000-01-01	80.8780487804878
2001-01-01	81.4243902439025
2002-01-01	81.4268292682927
2003-01-01	81.3780487804878
2004-01-01	81.8292682926829
2005-01-01	81.6292682926829
2006-01-01	82.3756097560976
2007-01-01	82.3268292682927
2008-01-01	82.3756097560976
2009-01-01	82.7756097560976
2010-01-01	82.9780487804878
2011-01-01	83.4219512195122
2012-01-01	83.4804878048781
2013-01-01	83.8317073170732
2014-01-01	83.9804878048781
2015-01-01	84.2780487804878
2016-01-01	84.2268292682927