Year Index 2010=1, Trend 1970-01-01 0.243052898360388 1971-01-01 0.264413161743962 1972-01-01 0.284954255873097 1973-01-01 0.283696411836748 1974-01-01 0.309656800313496 1975-01-01 0.364460705483263 1976-01-01 0.396090086982033 1977-01-01 0.423443957109112 1978-01-01 0.437586038041065 1979-01-01 0.466031024713493 1980-01-01 0.484451269208780 1981-01-01 0.510827170253437 1982-01-01 0.562265106871362 1983-01-01 0.598416408878978 1984-01-01 0.627876637539010 1985-01-01 0.650063557551925 1986-01-01 0.634594437431531 1987-01-01 0.622280930577834 1988-01-01 0.618209963748094 1989-01-01 0.641531230638828 1990-01-01 0.656735049927116 1991-01-01 0.696960489277829 1992-01-01 0.757039141677984 1993-01-01 0.770082206444446 1994-01-01 0.770531652623730 1995-01-01 0.810696162390273 1996-01-01 0.839517911354350 1997-01-01 0.824863504909778 1998-01-01 0.844502060457551 1999-01-01 0.874327472961037 2000-01-01 0.861676992420853 2001-01-01 0.854682742462524 2002-01-01 0.858990414302086 2003-01-01 0.883181763368080 2004-01-01 0.882359578733826 2005-01-01 0.865320363133580 2006-01-01 0.857062339600557 2007-01-01 0.892811204155886 2008-01-01 0.958201031702454 2009-01-01 0.995783169257663 2010-01-01 1.000000000000000