Annual Percent of Total
1960-01-01 8.57659990833626
1961-01-01 8.66876021664192
1962-01-01 8.76448020929714
1963-01-01 8.86083884915507
1964-01-01 8.95997537834985
1965-01-01 9.06431485535017
1966-01-01 9.20828350623256
1967-01-01 9.35079976008879
1968-01-01 9.49510124883239
1969-01-01 9.63242360439440
1970-01-01 9.76750928373454
1971-01-01 9.93160039233311
1972-01-01 10.08030605664200
1973-01-01 10.22063200144760
1974-01-01 10.35309327363520
1975-01-01 10.48467451204110
1976-01-01 10.66061589615020
1977-01-01 10.83748508754260
1978-01-01 11.00307510972930
1979-01-01 11.13140988233240
1980-01-01 11.21118385934960
1981-01-01 11.26119786959810
1982-01-01 11.25582407570050
1983-01-01 11.23015629450150
1984-01-01 11.23072121808240
1985-01-01 11.28290055439790
1986-01-01 11.40554767185710
1987-01-01 11.56551913908150
1988-01-01 11.74882402449490
1989-01-01 11.93205613090450
1990-01-01 12.10178834761300
1991-01-01 12.27821964319810
1992-01-01 12.45921361634980
1993-01-01 12.60605792508930
1994-01-01 12.74395105523020
1995-01-01 12.85874607587330
1996-01-01 13.00582055046450
1997-01-01 13.14289563266240
1998-01-01 13.27406403604660
1999-01-01 13.40432935302670
2000-01-01 13.53705233859460
2001-01-01 13.69153492251090
2002-01-01 13.84557080540010
2003-01-01 13.99948622464780
2004-01-01 14.14832396699750
2005-01-01 14.29336906279750
2006-01-01 14.44960271610090
2007-01-01 14.59638374681060
2008-01-01 14.74881060587120
2009-01-01 14.93306578917780
2010-01-01 15.16685918174620
2011-01-01 15.42749747827850
2012-01-01 15.73795133061120
2013-01-01 16.08155078734530
2014-01-01 16.43266218012920
2015-01-01 16.77755358913790
2016-01-01 17.11402134080660
2017-01-01 17.43484019691670