Year Index 2010=1, Trend 1970-01-01 0.385921072684934 1971-01-01 0.419853265448692 1972-01-01 0.451652412599528 1973-01-01 0.492754565532504 1974-01-01 0.537116472764067 1975-01-01 0.573441153607479 1976-01-01 0.590576229790524 1977-01-01 0.602851905870681 1978-01-01 0.615552520149189 1979-01-01 0.632794354064606 1980-01-01 0.670957728676370 1981-01-01 0.702689344402730 1982-01-01 0.733461028552276 1983-01-01 0.741564586504632 1984-01-01 0.748351532127561 1985-01-01 0.755455827437240 1986-01-01 0.767549849736840 1987-01-01 0.779214876027898 1988-01-01 0.781989992575644 1989-01-01 0.788672476469418 1990-01-01 0.798347223175759 1991-01-01 0.839683045687849 1992-01-01 0.890269367347361 1993-01-01 0.921598444348379 1994-01-01 0.933642828369600 1995-01-01 0.939678853981716 1996-01-01 0.938179886132116 1997-01-01 0.933179988600669 1998-01-01 0.932233902766182 1999-01-01 0.945322459724794 2000-01-01 0.954814087773466 2001-01-01 0.957438121828713 2002-01-01 0.961998856625779 2003-01-01 0.972630466749322 2004-01-01 0.973696699216655 2005-01-01 0.968497477802828 2006-01-01 0.951671680433760 2007-01-01 0.950927889514674 2008-01-01 0.978871895674609 2009-01-01 1.004511244636740 2010-01-01 1.000000000000000