Year Index 2010=1, Trend 1976-01-01 0.438633568220030 1977-01-01 0.457650661555797 1978-01-01 0.507341934901181 1979-01-01 0.495649080424453 1980-01-01 0.531941529641822 1981-01-01 0.577946882511554 1982-01-01 0.574273587854172 1983-01-01 0.575594888432665 1984-01-01 0.608312379243330 1985-01-01 0.633653086709901 1986-01-01 0.652869087478870 1987-01-01 0.668344858587131 1988-01-01 0.674287429702986 1989-01-01 0.689657347341582 1990-01-01 0.720519465917003 1991-01-01 0.750229536350900 1992-01-01 0.787626123391520 1993-01-01 0.816096046543198 1994-01-01 0.824349115087613 1995-01-01 0.827103504097955 1996-01-01 0.836735254651071 1997-01-01 0.836488718727412 1998-01-01 0.836749954321153 1999-01-01 0.845343626548598 2000-01-01 0.848714660965222 2001-01-01 0.858492690565452 2002-01-01 0.863007073079798 2003-01-01 0.881063085142846 2004-01-01 0.887843263006870 2005-01-01 0.905313377489917 2006-01-01 0.918272582654466 2007-01-01 0.933509337805730 2008-01-01 0.961832565374854 2009-01-01 0.991069151807558 2010-01-01 1.000000000000000