Year Index 2010=1, Trend 1970-01-01 0.208063565764670 1971-01-01 0.225731583915396 1972-01-01 0.244588767644371 1973-01-01 0.264220174104916 1974-01-01 0.303697216391325 1975-01-01 0.363123365712082 1976-01-01 0.396087419439424 1977-01-01 0.427903467046998 1978-01-01 0.446735975910932 1979-01-01 0.465969689910394 1980-01-01 0.483217640112141 1981-01-01 0.508307017991949 1982-01-01 0.535270787611179 1983-01-01 0.557900848593243 1984-01-01 0.575189827103404 1985-01-01 0.602945711189731 1986-01-01 0.619907338233220 1987-01-01 0.627060060740133 1988-01-01 0.624021017857646 1989-01-01 0.645457524023126 1990-01-01 0.674005964301924 1991-01-01 0.719418302522391 1992-01-01 0.752750960883970 1993-01-01 0.778620771572609 1994-01-01 0.792626656238700 1995-01-01 0.794500251553865 1996-01-01 0.795718766161596 1997-01-01 0.791589809432148 1998-01-01 0.800001227073531 1999-01-01 0.812473695068556 2000-01-01 0.817375421990180 2001-01-01 0.847752753657716 2002-01-01 0.867842342901468 2003-01-01 0.876021988557726 2004-01-01 0.877321540322474 2005-01-01 0.888359877006079 2006-01-01 0.905393197725988 2007-01-01 0.925849076528126 2008-01-01 0.956713835663519 2009-01-01 0.990795166120250 2010-01-01 1.000000000000000