Year	Percent of Total
1960-01-01	3.19873875057479
1961-01-01	3.23550371468591
1962-01-01	3.26663298986654
1963-01-01	3.29459933994361
1964-01-01	3.32354979317391
1965-01-01	3.35544593177171
1966-01-01	3.38274028248263
1967-01-01	3.40852609777680
1968-01-01	3.43370477957175
1969-01-01	3.45955302362713
1970-01-01	3.48748194297253
1971-01-01	3.52230196985910
1972-01-01	3.55819356508297
1973-01-01	3.59412700895946
1974-01-01	3.62739730855954
1975-01-01	3.65705444932607
1976-01-01	3.70232399502233
1977-01-01	3.73635395818251
1978-01-01	3.76430258736888
1979-01-01	3.79204015405486
1980-01-01	3.82241882897414
1981-01-01	3.84798083788992
1982-01-01	3.87421700474557
1983-01-01	3.90069458851120
1984-01-01	3.92608566963175
1985-01-01	3.95065016697414
1986-01-01	3.97899497665682
1987-01-01	4.00436398900921
1988-01-01	4.02928550488179
1989-01-01	4.05788527090378
1990-01-01	4.09222966190146
1991-01-01	4.14686555288534
1992-01-01	4.20401756387026
1993-01-01	4.25839218899923
1994-01-01	4.30114647216594
1995-01-01	4.32924792841614
1996-01-01	4.35773628973612
1997-01-01	4.37136470894380
1998-01-01	4.38080997227522
1999-01-01	4.40013030752537
2000-01-01	4.43723009033134
2001-01-01	4.49740910409157
2002-01-01	4.57389349148088
2003-01-01	4.66036608742945
2004-01-01	4.74746394470996
2005-01-01	4.83101181711171
2006-01-01	4.93248448526857
2007-01-01	5.02710370273404
2008-01-01	5.12083692113118
2009-01-01	5.22229948348822
2010-01-01	5.33643419990444
2011-01-01	5.44960002593035
2012-01-01	5.57353494213006
2013-01-01	5.70947795611948
2014-01-01	5.85822325970945
2015-01-01	6.02042228795718
2016-01-01	6.19535937982320
2017-01-01	6.37827127491284