Year	Percent of Total
1960-01-01	2.75192310996810
1961-01-01	2.76595804203630
1962-01-01	2.76969445021825
1963-01-01	2.76653730840312
1964-01-01	2.75473306333324
1965-01-01	2.73658778278925
1966-01-01	2.74887021633519
1967-01-01	2.75165794745133
1968-01-01	2.74766665087412
1969-01-01	2.73646872145908
1970-01-01	2.72048711212418
1971-01-01	2.73241678568703
1972-01-01	2.73722550452110
1973-01-01	2.73573097720532
1974-01-01	2.72854886822250
1975-01-01	2.71631490994615
1976-01-01	2.73023589028045
1977-01-01	2.73959405073093
1978-01-01	2.74121280783143
1979-01-01	2.73890225235076
1980-01-01	2.73297401934462
1981-01-01	2.75384853108763
1982-01-01	2.77017757107301
1983-01-01	2.78238546603475
1984-01-01	2.78818664188148
1985-01-01	2.78703986044236
1986-01-01	2.77741837511560
1987-01-01	2.76337636150446
1988-01-01	2.74743396264129
1989-01-01	2.73153496773078
1990-01-01	2.71868284703607
1991-01-01	2.73875000988005
1992-01-01	2.75718129783209
1993-01-01	2.77568247612348
1994-01-01	2.79461951593482
1995-01-01	2.81361626658007
1996-01-01	2.84192535069528
1997-01-01	2.86684694644894
1998-01-01	2.88993566333239
1999-01-01	2.91336602179167
2000-01-01	2.93857186462522
2001-01-01	2.98650327561894
2002-01-01	3.02267491881991
2003-01-01	3.04333671757747
2004-01-01	3.04377961614643
2005-01-01	3.02213726169280
2006-01-01	3.03976567896519
2007-01-01	3.04743182301302
2008-01-01	3.04807070861345
2009-01-01	3.04563067736676
2010-01-01	3.04195975700902
2011-01-01	3.05943727769988
2012-01-01	3.07597275344948
2013-01-01	3.09078725492664
2014-01-01	3.10216145972078
2015-01-01	3.10945094468507
2016-01-01	3.13923481384084
2017-01-01	3.16342098834598