Year Index 2010=1, Trend 1971-01-01 0.174514919219480 1972-01-01 0.180931043232745 1973-01-01 0.195947039853713 1974-01-01 0.228110502851833 1975-01-01 0.262998695625811 1976-01-01 0.289484376765901 1977-01-01 0.313708450608550 1978-01-01 0.330841449404471 1979-01-01 0.341882418256747 1980-01-01 0.374830731236833 1981-01-01 0.420787022347833 1982-01-01 0.474152159230411 1983-01-01 0.506316826959595 1984-01-01 0.524368713226501 1985-01-01 0.537132000577331 1986-01-01 0.567884882384006 1987-01-01 0.569458064334396 1988-01-01 0.587495257935053 1989-01-01 0.633681574342631 1990-01-01 0.669623407532607 1991-01-01 0.670306079528937 1992-01-01 0.701650896456776 1993-01-01 0.692463530084181 1994-01-01 0.688266172833230 1995-01-01 0.742259454831464 1996-01-01 0.756995031959566 1997-01-01 0.758921250946256 1998-01-01 0.755572808614888 1999-01-01 0.766677004460374 2000-01-01 0.771323959105920 2001-01-01 0.783616756773776 2002-01-01 0.797615098923016 2003-01-01 0.810553804749058 2004-01-01 0.834078107107756 2005-01-01 0.888358233636044 2006-01-01 0.916019582751992 2007-01-01 0.948901473244018 2008-01-01 0.969346336407305 2009-01-01 0.993586551207131 2010-01-01 1.000000000000000