Year Index 2010=1, Trend 1970-01-01 0.0552575719188511 1971-01-01 0.0601932159184191 1972-01-01 0.0674710793801503 1973-01-01 0.0760571207729998 1974-01-01 0.0937874769079380 1975-01-01 0.1104008497244880 1976-01-01 0.1296817877225550 1977-01-01 0.1525110786522540 1978-01-01 0.1886392985053590 1979-01-01 0.2344249811133770 1980-01-01 0.2871732210998730 1981-01-01 0.3371177878981920 1982-01-01 0.3592014582782120 1983-01-01 0.3897872050981860 1984-01-01 0.4020360006222550 1985-01-01 0.4104672966499280 1986-01-01 0.4218492504756130 1987-01-01 0.4401971407936380 1988-01-01 0.4836035770701620 1989-01-01 0.5112005637888900 1990-01-01 0.5564842124678890 1991-01-01 0.6319140338726260 1992-01-01 0.6850794155952190 1993-01-01 0.7315911518847900 1994-01-01 0.7831059163418830 1995-01-01 0.8551334307121020 1996-01-01 0.9208591886093870 1997-01-01 0.9146576563923220 1998-01-01 0.9075763005065750 1999-01-01 0.8663611465711880 2000-01-01 0.8521351000676790 2001-01-01 0.8835775064255880 2002-01-01 0.9007823986592390 2003-01-01 0.9477350208553090 2004-01-01 0.9511303008636780 2005-01-01 0.9593356830549120 2006-01-01 0.9502214112207140 2007-01-01 0.9519011514731530 2008-01-01 0.9806512553742480 2009-01-01 1.0090633070643700 2010-01-01 1.0000000000000000