Year Index 2010=1, Trend 1976-01-01 0.516295552943616 1977-01-01 0.542225145577821 1978-01-01 0.593206591095795 1979-01-01 0.588014155432482 1980-01-01 0.620782472747251 1981-01-01 0.667658964016230 1982-01-01 0.673611036026701 1983-01-01 0.668229650760889 1984-01-01 0.701424191035012 1985-01-01 0.711825941097363 1986-01-01 0.730566203897851 1987-01-01 0.746841266802468 1988-01-01 0.744573710422429 1989-01-01 0.761613443986028 1990-01-01 0.787159901516195 1991-01-01 0.820707638497632 1992-01-01 0.855777903600374 1993-01-01 0.877844784424000 1994-01-01 0.895746115073908 1995-01-01 0.882773933536794 1996-01-01 0.882810088726722 1997-01-01 0.880893230104126 1998-01-01 0.881508113902936 1999-01-01 0.882036782275844 2000-01-01 0.874071144030719 2001-01-01 0.880262500970484 2002-01-01 0.887242092734608 2003-01-01 0.896908667512871 2004-01-01 0.892878466402481 2005-01-01 0.903670323727447 2006-01-01 0.908968660254192 2007-01-01 0.919938992380563 2008-01-01 0.961855939822413 2009-01-01 1.005305439497100 2010-01-01 1.000000000000000