Year Index 2010=1, Trend 1970-01-01 0.396322028170886 1971-01-01 0.430425108661911 1972-01-01 0.455718765961795 1973-01-01 0.489286667587180 1974-01-01 0.532787428487862 1975-01-01 0.563217136599550 1976-01-01 0.576177282883270 1977-01-01 0.595223408934548 1978-01-01 0.615145947308250 1979-01-01 0.645230287885050 1980-01-01 0.681819460010173 1981-01-01 0.707780573360129 1982-01-01 0.731130791475644 1983-01-01 0.739567404165664 1984-01-01 0.743945101029067 1985-01-01 0.753434626130184 1986-01-01 0.774264139063870 1987-01-01 0.795608099656248 1988-01-01 0.798242114852025 1989-01-01 0.801516944181246 1990-01-01 0.819783175750778 1991-01-01 0.863199742955345 1992-01-01 0.925605856415073 1993-01-01 0.963749456660936 1994-01-01 0.972713154592762 1995-01-01 0.991788703203208 1996-01-01 0.995265637059737 1997-01-01 0.980939188759030 1998-01-01 0.982948205333072 1999-01-01 0.991602455211712 2000-01-01 0.991730624587862 2001-01-01 0.993860557188628 2002-01-01 0.996648125964531 2003-01-01 1.002187284297780 2004-01-01 0.995302682185266 2005-01-01 0.983267968429324 2006-01-01 0.960100116489454 2007-01-01 0.945051671672346 2008-01-01 0.957606387894572 2009-01-01 0.986652273098374 2010-01-01 1.000000000000000