Year Index 2010=1, Trend 1976-01-01 0.487869133321279 1977-01-01 0.512107410734602 1978-01-01 0.566923804480488 1979-01-01 0.536507089606210 1980-01-01 0.575619151430289 1981-01-01 0.638041557727301 1982-01-01 0.638433227888557 1983-01-01 0.628212831394304 1984-01-01 0.667338119601009 1985-01-01 0.684871662734010 1986-01-01 0.697739645703654 1987-01-01 0.703474920825744 1988-01-01 0.698022196852967 1989-01-01 0.714313585459934 1990-01-01 0.740284630897804 1991-01-01 0.763427058910111 1992-01-01 0.791434533493014 1993-01-01 0.826610501920302 1994-01-01 0.836282002197944 1995-01-01 0.830673318227659 1996-01-01 0.833134570962797 1997-01-01 0.825094948979461 1998-01-01 0.824747778152581 1999-01-01 0.837124501709511 2000-01-01 0.841362898592871 2001-01-01 0.842099968506827 2002-01-01 0.844138206185619 2003-01-01 0.862144455084270 2004-01-01 0.878552124491406 2005-01-01 0.895518854256848 2006-01-01 0.904436294963973 2007-01-01 0.915176306359082 2008-01-01 0.953870292410220 2009-01-01 0.995959843828595 2010-01-01 1.000000000000000