Year	Percent of Total
1960-01-01	43.3642192799686
1961-01-01	43.4867125560975
1962-01-01	43.5053461812826
1963-01-01	43.4633180921071
1964-01-01	43.4125261928843
1965-01-01	43.3780469333040
1966-01-01	43.5602442990187
1967-01-01	43.7045895754615
1968-01-01	43.8156350354829
1969-01-01	43.8831601204261
1970-01-01	43.8999377059446
1971-01-01	44.1053374614870
1972-01-01	44.2337834881776
1973-01-01	44.3010148949901
1974-01-01	44.3263144888567
1975-01-01	44.3226644428453
1976-01-01	44.4849077453012
1977-01-01	44.5842693385517
1978-01-01	44.6334681845932
1979-01-01	44.6380320322545
1980-01-01	44.5977347894877
1981-01-01	44.7411058531181
1982-01-01	44.8255472738958
1983-01-01	44.8629348003491
1984-01-01	44.8677220115987
1985-01-01	44.8532876697018
1986-01-01	44.9916189312694
1987-01-01	45.0588003618035
1988-01-01	45.0815240809470
1989-01-01	45.0934233916117
1990-01-01	45.1207050577905
1991-01-01	45.2626791304148
1992-01-01	45.3748709338074
1993-01-01	45.4597881035737
1994-01-01	45.4917416206670
1995-01-01	45.4392593626886
1996-01-01	45.5681718708090
1997-01-01	45.6232338354520
1998-01-01	45.6141830976169
1999-01-01	45.5753453580689
2000-01-01	45.5403151478043
2001-01-01	45.6307574658837
2002-01-01	45.6934916368079
2003-01-01	45.7392603736993
2004-01-01	45.7686025608712
2005-01-01	45.7828789857647
2006-01-01	45.9212439181918
2007-01-01	46.0105421722324
2008-01-01	46.0678861531681
2009-01-01	46.1092845977535
2010-01-01	46.1405756866326
2011-01-01	46.2635240609197
2012-01-01	46.3453563812657
2013-01-01	46.3885659484172
2014-01-01	46.3891457819189
2015-01-01	46.3440549770325
2016-01-01	46.3457237998407
2017-01-01	46.2821017382004