Year Index 2010=1, Trend 1970-01-01 0.309689615047061 1971-01-01 0.341033097100743 1972-01-01 0.365859553568305 1973-01-01 0.407576516119917 1974-01-01 0.455253828191675 1975-01-01 0.512892201435004 1976-01-01 0.538843595507582 1977-01-01 0.563252023553435 1978-01-01 0.612660815659578 1979-01-01 0.614550897806006 1980-01-01 0.647660799884350 1981-01-01 0.694818258704991 1982-01-01 0.709815481424842 1983-01-01 0.714897298980296 1984-01-01 0.747612366999772 1985-01-01 0.767131559624446 1986-01-01 0.789214656990372 1987-01-01 0.807671989344393 1988-01-01 0.810227048871706 1989-01-01 0.824371994552992 1990-01-01 0.847722489886203 1991-01-01 0.883265157855479 1992-01-01 0.918582181095852 1993-01-01 0.932554343625888 1994-01-01 0.938646086342115 1995-01-01 0.911398997015389 1996-01-01 0.911497667727511 1997-01-01 0.902584837137440 1998-01-01 0.899469191650966 1999-01-01 0.902139753215194 2000-01-01 0.900883073380215 2001-01-01 0.905055011345645 2002-01-01 0.909104556992864 2003-01-01 0.917940760364091 2004-01-01 0.912345105822335 2005-01-01 0.915499589925860 2006-01-01 0.921260638938674 2007-01-01 0.927493824445004 2008-01-01 0.958806008246978 2009-01-01 1.005004531452470 2010-01-01 1.000000000000000