Year	Percent of Total
1960-01-01	2.70764414148579
1961-01-01	2.68884232060602
1962-01-01	2.66287676556306
1963-01-01	2.62923523346374
1964-01-01	2.58611006557027
1965-01-01	2.53370625050940
1966-01-01	2.53950658495569
1967-01-01	2.53568284523740
1968-01-01	2.52352034143991
1969-01-01	2.50522869490933
1970-01-01	2.48199623380045
1971-01-01	2.49883649875295
1972-01-01	2.51014311478727
1973-01-01	2.51648284911004
1974-01-01	2.51747851359509
1975-01-01	2.51323117376691
1976-01-01	2.54009381874287
1977-01-01	2.56121074157829
1978-01-01	2.57673152300607
1979-01-01	2.58693493686183
1980-01-01	2.59203387553919
1981-01-01	2.61260624644746
1982-01-01	2.62843579237971
1983-01-01	2.64054672629144
1984-01-01	2.65004439236042
1985-01-01	2.65861885240488
1986-01-01	2.69743574079448
1987-01-01	2.72264165795106
1988-01-01	2.73624054754770
1989-01-01	2.74194815818197
1990-01-01	2.74238573378330
1991-01-01	2.79774626676795
1992-01-01	2.84309443135076
1993-01-01	2.87545882607908
1994-01-01	2.88693968670801
1995-01-01	2.86708407828602
1996-01-01	2.89945796132935
1997-01-01	2.93152432247232
1998-01-01	2.96156197381508
1999-01-01	2.99208662562927
2000-01-01	3.02633055629180
2001-01-01	3.05654559891673
2002-01-01	3.08792976805085
2003-01-01	3.12160990887062
2004-01-01	3.15708644001307
2005-01-01	3.19337683874105
2006-01-01	3.22408005902587
2007-01-01	3.25371465992232
2008-01-01	3.28446003599645
2009-01-01	3.31955386324439
2010-01-01	3.36097692385325
2011-01-01	3.39076321936457
2012-01-01	3.42114229481308
2013-01-01	3.44791182993677
2014-01-01	3.46472122772661
2015-01-01	3.46988117288003
2016-01-01	3.46196833713114
2017-01-01	3.44141891267565