Year Index 2010=1, Trend 1978-01-01 0.119428485954184 1979-01-01 0.137275197342285 1980-01-01 0.161877311762094 1981-01-01 0.195666572830031 1982-01-01 0.228184224796768 1983-01-01 0.234792473836136 1984-01-01 0.245878097337937 1985-01-01 0.295469136351504 1986-01-01 0.373553999141624 1987-01-01 0.451437978006387 1988-01-01 0.502504769165506 1989-01-01 0.527033549447723 1990-01-01 0.530095473753178 1991-01-01 0.525200835810696 1992-01-01 0.534317945574061 1993-01-01 0.543971070499167 1994-01-01 0.595269385302184 1995-01-01 0.627800853432981 1996-01-01 0.668940974667283 1997-01-01 0.701670416176907 1998-01-01 0.723034713189589 1999-01-01 0.719122414740677 2000-01-01 0.721608125916314 2001-01-01 0.730425605672237 2002-01-01 0.744312339775124 2003-01-01 0.770861876215147 2004-01-01 0.801714543151639 2005-01-01 0.856949724767241 2006-01-01 0.888867627432454 2007-01-01 0.885431151573581 2008-01-01 0.914795345060495 2009-01-01 0.960345705075375 2010-01-01 1.000000000000000