Year	Percent of Total
1960-01-01	62.6771991031070
1961-01-01	62.6050320879522
1962-01-01	62.6269486540037
1963-01-01	62.7140639334916
1964-01-01	62.8134919070542
1965-01-01	62.9023844188407
1966-01-01	62.9490966863930
1967-01-01	63.0064657071522
1968-01-01	63.0673512393791
1969-01-01	63.1524929259717
1970-01-01	63.2455614423528
1971-01-01	63.3834051828057
1972-01-01	63.5276884868163
1973-01-01	63.6833729577500
1974-01-01	63.8767082193077
1975-01-01	64.1068470153659
1976-01-01	64.2442166697764
1977-01-01	64.4354565907144
1978-01-01	64.6699499463023
1979-01-01	64.9371139409411
1980-01-01	65.2302103497993
1981-01-01	65.5533336432035
1982-01-01	65.8856743687390
1983-01-01	66.2060122456455
1984-01-01	66.4935615223380
1985-01-01	66.7349066334055
1986-01-01	66.8407286876408
1987-01-01	66.9314918346617
1988-01-01	67.0062105893072
1989-01-01	67.0629833995220
1990-01-01	67.1012876457315
1991-01-01	67.0944909321117
1992-01-01	67.0710801383919
1993-01-01	67.0466802978209
1994-01-01	67.0462163631056
1995-01-01	67.0809075946748
1996-01-01	67.0750785695168
1997-01-01	67.1140143927364
1998-01-01	67.1784765507138
1999-01-01	67.2383305990768
2000-01-01	67.2782051290419
2001-01-01	67.3147555819367
2002-01-01	67.3263426552549
2003-01-01	67.3272339410977
2004-01-01	67.3371096448390
2005-01-01	67.3598657228713
2006-01-01	67.2882904085004
2007-01-01	67.2235959802829
2008-01-01	67.1541147486984
2009-01-01	67.0537657285995
2010-01-01	66.9062571503783
2011-01-01	66.6913054307584
2012-01-01	66.4463454046479
2013-01-01	66.1594239932007
2014-01-01	65.8420973857208