Year Index 2010=1, Trend 1978-01-01 0.214813354083239 1979-01-01 0.248388949746754 1980-01-01 0.295128373722111 1981-01-01 0.342065431694073 1982-01-01 0.384548743495941 1983-01-01 0.386148489563607 1984-01-01 0.395034526997715 1985-01-01 0.477603631669732 1986-01-01 0.568429866236590 1987-01-01 0.658324712887760 1988-01-01 0.697833100600690 1989-01-01 0.705109143316407 1990-01-01 0.716742175307974 1991-01-01 0.712958122490051 1992-01-01 0.709585858867231 1993-01-01 0.703758734433561 1994-01-01 0.719038682516884 1995-01-01 0.728541905167444 1996-01-01 0.760827659890407 1997-01-01 0.782317074368604 1998-01-01 0.787237242614306 1999-01-01 0.751703539054880 2000-01-01 0.730569573717407 2001-01-01 0.743417675453579 2002-01-01 0.758255564307144 2003-01-01 0.787397577221978 2004-01-01 0.807353248676161 2005-01-01 0.842038969064414 2006-01-01 0.875628795039368 2007-01-01 0.874205489157472 2008-01-01 0.917732116077419 2009-01-01 0.963273819357443 2010-01-01 1.000000000000000