Year	Percent of Total
1960-01-01	5.57899420803310
1961-01-01	5.72090199448988
1962-01-01	5.85820475897752
1963-01-01	5.99362033943457
1964-01-01	6.13022844339161
1965-01-01	6.26994815420814
1966-01-01	6.42765800211493
1967-01-01	6.58194068838480
1968-01-01	6.73256645658076
1969-01-01	6.87860244945488
1970-01-01	7.01975943160860
1971-01-01	7.16879475084562
1972-01-01	7.30686247225865
1973-01-01	7.43431227885756
1974-01-01	7.55073620837149
1975-01-01	7.65598616640404
1976-01-01	7.79359879793718
1977-01-01	7.91384510296588
1978-01-01	8.02013260555557
1979-01-01	8.11774184098602
1980-01-01	8.21114066917224
1981-01-01	8.29024217327712
1982-01-01	8.37317751435841
1983-01-01	8.45737959033959
1984-01-01	8.53730555734546
1985-01-01	8.61147022570795
1986-01-01	8.72523806727522
1987-01-01	8.81510982739742
1988-01-01	8.89182585079526
1989-01-01	8.96945318590220
1990-01-01	9.05348191135896
1991-01-01	9.16093725362580
1992-01-01	9.27064626749112
1993-01-01	9.37708593410139
1994-01-01	9.47036318387157
1995-01-01	9.54714890040565
1996-01-01	9.64929894062855
1997-01-01	9.73577054777270
1998-01-01	9.80737876014822
1999-01-01	9.86541227766768
2000-01-01	9.91158809299679
2001-01-01	9.97504797578342
2002-01-01	10.01773320590970
2003-01-01	10.04810075360400
2004-01-01	10.07663671402720
2005-01-01	10.11025076504350
2006-01-01	10.16038367102820
2007-01-01	10.21342037012350
2008-01-01	10.27121500909720
2009-01-01	10.33432667293420
2010-01-01	10.40473643813660
2011-01-01	10.50346810667210
2012-01-01	10.60134372878620
2013-01-01	10.70165262397620
2014-01-01	10.80895822308730
2015-01-01	10.92630171083200
2016-01-01	11.06082386128450
2017-01-01	11.19844685829730