Year	Percent of Total
1960-01-01	2.89624955844599
1961-01-01	2.90330145838356
1962-01-01	2.90409080794411
1963-01-01	2.89860014406718
1964-01-01	2.88652649924625
1965-01-01	2.86809184675051
1966-01-01	2.89289088062469
1967-01-01	2.90808917254817
1968-01-01	2.91475010867386
1969-01-01	2.91457607387735
1970-01-01	2.90875889630596
1971-01-01	2.93100901769421
1972-01-01	2.94668124252253
1973-01-01	2.95570158265745
1974-01-01	2.95766494866335
1975-01-01	2.95301484029335
1976-01-01	2.98104222089567
1977-01-01	3.00239184449584
1978-01-01	3.01774999577117
1979-01-01	3.02750391713335
1980-01-01	3.03195314558925
1981-01-01	3.04495162918056
1982-01-01	3.04890823724101
1983-01-01	3.04596188072007
1984-01-01	3.03836102088044
1985-01-01	3.02718490415412
1986-01-01	3.04675791076086
1987-01-01	3.06318739619413
1988-01-01	3.07555225419382
1989-01-01	3.08270950740758
1990-01-01	3.08461312408333
1991-01-01	3.10309833689976
1992-01-01	3.11621241703805
1993-01-01	3.12541848170170
1994-01-01	3.13287385040855
1995-01-01	3.14016329539286
1996-01-01	3.15145039433640
1997-01-01	3.15859205747333
1998-01-01	3.16212369455753
1999-01-01	3.16159220694982
2000-01-01	3.15670704546449
2001-01-01	3.16951518267697
2002-01-01	3.17775899572445
2003-01-01	3.18292883896349
2004-01-01	3.18670211580071
2005-01-01	3.19033307560329
2006-01-01	3.21298908461167
2007-01-01	3.23229287888326
2008-01-01	3.24829497092967
2009-01-01	3.26112713018626
2010-01-01	3.27161802134080
2011-01-01	3.29145322506541
2012-01-01	3.30828831462542
2013-01-01	3.32247514186076
2014-01-01	3.33386102967196
2015-01-01	3.34310572620832
2016-01-01	3.35790384068583
2017-01-01	3.36854851177139