Year Index 2010=1, Trend 1977-01-01 0.0554863626449177 1978-01-01 0.0563087301585333 1979-01-01 0.0667500657608998 1980-01-01 0.0817642082497841 1981-01-01 0.0983846720143018 1982-01-01 0.1264442221946710 1983-01-01 0.1550830174907560 1984-01-01 0.1750730714349050 1985-01-01 0.2073699015102590 1986-01-01 0.2404385836289020 1987-01-01 0.2544906961509200 1988-01-01 0.2340011870571450 1989-01-01 0.2653126656334700 1990-01-01 0.2666257680240610 1991-01-01 0.3288318750467260 1992-01-01 0.3745814645034360 1993-01-01 0.4096795919964300 1994-01-01 0.3986674037575440 1995-01-01 0.4061245319205330 1996-01-01 0.4431098107713540 1997-01-01 0.4823835064495460 1998-01-01 0.5401952043099420 1999-01-01 0.5746225585476560 2000-01-01 0.6240972173538660 2001-01-01 0.6299552993399340 2002-01-01 0.7020072569334650 2003-01-01 0.7624837297109220 2004-01-01 0.7809838247911140 2005-01-01 0.8095419699622480 2006-01-01 0.8444106623872000 2007-01-01 0.8974772180353730 2008-01-01 0.9439310265903100 2009-01-01 0.9870360151424830 2010-01-01 1.0000000000000000