Year	Percent of Total
1960-01-01	2.93664476147608
1961-01-01	2.95002679379087
1962-01-01	2.95404733406624
1963-01-01	2.94964158783467
1964-01-01	2.93801197903465
1965-01-01	2.92022556739099
1966-01-01	2.93591578247777
1967-01-01	2.94407286880900
1968-01-01	2.94555993027835
1969-01-01	2.94095480502109
1970-01-01	2.93105821064109
1971-01-01	2.94946842327202
1972-01-01	2.95975721345519
1973-01-01	2.96251763538898
1974-01-01	2.95832875364574
1975-01-01	2.94795655045932
1976-01-01	2.96373983650667
1977-01-01	2.97290427054364
1978-01-01	2.97674716736357
1979-01-01	2.97619914309084
1980-01-01	2.97191339432428
1981-01-01	2.98083778058643
1982-01-01	2.98349087005904
1983-01-01	2.98093135986317
1984-01-01	2.97418050000413
1985-01-01	2.96416020202701
1986-01-01	2.97814074570656
1987-01-01	2.98695635564816
1988-01-01	2.99122570550381
1989-01-01	2.99157263615379
1990-01-01	2.98883556584794
1991-01-01	3.00104060486863
1992-01-01	3.00805025081369
1993-01-01	3.01093363946636
1994-01-01	3.01093392234914
1995-01-01	3.00904095997518
1996-01-01	3.02007337544690
1997-01-01	3.02562006650503
1998-01-01	3.02592867149758
1999-01-01	3.02052597878091
2000-01-01	3.00931640974814
2001-01-01	3.01554320567843
2002-01-01	3.01489237343616
2003-01-01	3.00901516724882
2004-01-01	2.99963744105900
2005-01-01	2.98802207468912
2006-01-01	3.00154581314248
2007-01-01	3.01092761340620
2008-01-01	3.01639585898369
2009-01-01	3.01816348817494
2010-01-01	3.01701709525055
2011-01-01	3.02765732510256
2012-01-01	3.03471959649538
2013-01-01	3.03975356696431
2014-01-01	3.04437769121921
2015-01-01	3.04983467554518
2016-01-01	3.06955923568253
2017-01-01	3.08766699186963