Year Index 2010=1, Trend 1970-01-01 0.189244098038432 1971-01-01 0.199619549047713 1972-01-01 0.211430503334558 1973-01-01 0.228003932076576 1974-01-01 0.261792143803531 1975-01-01 0.297965703484264 1976-01-01 0.324430513250136 1977-01-01 0.350631852657412 1978-01-01 0.367965452036356 1979-01-01 0.397099977647066 1980-01-01 0.445341873606024 1981-01-01 0.523786997719804 1982-01-01 0.569660788578162 1983-01-01 0.580701185838582 1984-01-01 0.607096056357019 1985-01-01 0.627604059066976 1986-01-01 0.642783845954581 1987-01-01 0.675728867927291 1988-01-01 0.713721274392937 1989-01-01 0.747295853443187 1990-01-01 0.781120504462664 1991-01-01 0.817141420648425 1992-01-01 0.816954611625536 1993-01-01 0.812221029210076 1994-01-01 0.798749628872959 1995-01-01 0.807727267745127 1996-01-01 0.827028681158249 1997-01-01 0.852269985588370 1998-01-01 0.868774782340001 1999-01-01 0.866673919731342 2000-01-01 0.893203337524790 2001-01-01 0.897923560038652 2002-01-01 0.890888412238122 2003-01-01 0.906539204171870 2004-01-01 0.929653489571476 2005-01-01 0.942886920684374 2006-01-01 0.968450048906095 2007-01-01 0.989294558160481 2008-01-01 0.995945963640726 2009-01-01 0.990995745838844 2010-01-01 1.000000000000000