Year	Percent of Total
1960-01-01	10.8243162485537
1961-01-01	10.9692824808390
1962-01-01	11.1024842299573
1963-01-01	11.2350017431762
1964-01-01	11.3747304240514
1965-01-01	11.5210457928102
1966-01-01	11.7499300581495
1967-01-01	11.9676148246551
1968-01-01	12.1780403413591
1969-01-01	12.3776909472786
1970-01-01	12.5646219249385
1971-01-01	12.7556059446097
1972-01-01	12.9164336444482
1973-01-01	13.0489727807728
1974-01-01	13.1544552933036
1975-01-01	13.2288838729544
1976-01-01	13.4228357321547
1977-01-01	13.5775333734483
1978-01-01	13.6783974431763
1979-01-01	13.7030064307352
1980-01-01	13.6408836440152
1981-01-01	13.6531233808778
1982-01-01	13.5870369051597
1983-01-01	13.4755888914742
1984-01-01	13.3662297188316
1985-01-01	13.2894865952181
1986-01-01	13.2683784238308
1987-01-01	13.2697168789311
1988-01-01	13.2936667040880
1989-01-01	13.3376223835470
1990-01-01	13.3973823374569
1991-01-01	13.5138422992504
1992-01-01	13.6386863365305
1993-01-01	13.7572137798947
1994-01-01	13.8497588418445
1995-01-01	13.9106061756858
1996-01-01	13.9971352587808
1997-01-01	14.0465838361422
1998-01-01	14.0696000544815
1999-01-01	14.0765938107230
2000-01-01	14.0737394606320
2001-01-01	14.1765750866655
2002-01-01	14.2635319994772
2003-01-01	14.3346403709185
2004-01-01	14.3876198212116
2005-01-01	14.4206953490505
2006-01-01	14.3326015886449
2007-01-01	14.2293805637826
2008-01-01	14.1256016738644
2009-01-01	14.0425043171281
2010-01-01	13.9930181594797
2011-01-01	13.9560065468967
2012-01-01	13.9419257044218
2013-01-01	13.9469563317735
2014-01-01	13.9640060684934
2015-01-01	13.9942231107331
2016-01-01	14.1484019890681
2017-01-01	14.3118149643074