Year	Percent of Total
1960-01-01	42.5945056272853
1961-01-01	42.8580972361995
1962-01-01	43.0043594891082
1963-01-01	43.0608733082849
1964-01-01	43.0596382824313
1965-01-01	43.0207626879744
1966-01-01	43.2149450543858
1967-01-01	43.3370966967581
1968-01-01	43.4036476706703
1969-01-01	43.3991059241382
1970-01-01	43.2966773918125
1971-01-01	43.4422837752325
1972-01-01	43.4132791101754
1973-01-01	43.2796787685596
1974-01-01	43.2357345436421
1975-01-01	43.5138339106053
1976-01-01	43.7116109243359
1977-01-01	43.8546974517345
1978-01-01	43.9990291154614
1979-01-01	44.0244456519274
1980-01-01	43.7632467103184
1981-01-01	43.8549906796074
1982-01-01	43.9191816865105
1983-01-01	43.8759862437725
1984-01-01	43.7479512241677
1985-01-01	43.6166500483825
1986-01-01	43.7316439419854
1987-01-01	43.8381763520629
1988-01-01	43.9583855235549
1989-01-01	44.0719131285593
1990-01-01	44.1374319739225
1991-01-01	44.4177766547352
1992-01-01	44.6232672199028
1993-01-01	44.7848090862922
1994-01-01	44.9819447744541
1995-01-01	45.2943414925630
1996-01-01	45.7064141161821
1997-01-01	46.1202645783858
1998-01-01	46.5342423725763
1999-01-01	46.8923587001308
2000-01-01	47.1482095225434
2001-01-01	47.5157582918112
2002-01-01	47.7154675362737
2003-01-01	47.7989857465086
2004-01-01	47.8406180643615
2005-01-01	47.8777320681945
2006-01-01	47.8945808376446
2007-01-01	47.9213660867741
2008-01-01	47.9229020387930
2009-01-01	47.8421317408027
2010-01-01	47.6612438017616
2011-01-01	47.5821753404449
2012-01-01	47.3864160574426
2013-01-01	47.1273189587027
2014-01-01	46.8763442948985
2015-01-01	46.6665861382218
2016-01-01	46.5394598517837
2017-01-01	46.4322762121517