Year Percent Change at Annual Rate 1961-01-01 1.561657693757820 1962-01-01 1.366940529721430 1963-01-01 1.344433780595950 1964-01-01 1.323002232400070 1965-01-01 1.265291261536600 1966-01-01 1.188344885003260 1967-01-01 1.128030922173830 1968-01-01 1.011149860596490 1969-01-01 1.205505969016060 1970-01-01 1.084320632208720 1971-01-01 1.151489359600050 1972-01-01 1.162776565283680 1973-01-01 1.053957872898990 1974-01-01 1.155081619599540 1975-01-01 1.084750019243220 1976-01-01 0.912459210566993 1977-01-01 0.922031598436490 1978-01-01 0.912165511494806 1979-01-01 0.916187294244835 1980-01-01 0.895161302141773 1981-01-01 0.876113701573317 1982-01-01 0.826709034277371 1983-01-01 0.783995047857687 1984-01-01 0.743994656165299 1985-01-01 0.744786397683541 1986-01-01 0.768557201809656 1987-01-01 0.758118092309388 1988-01-01 0.765607877904344 1989-01-01 0.806909542910049 1990-01-01 0.852740122728164 1991-01-01 0.902232122381136 1992-01-01 0.907636159140154 1993-01-01 0.857880609328504 1994-01-01 0.805594643088114 1995-01-01 0.782214692354017 1996-01-01 0.755450061593123 1997-01-01 0.744772168932627 1998-01-01 0.709724122025278 1999-01-01 0.704780920326002 2000-01-01 0.681994921390185 2001-01-01 0.705789361654510 2002-01-01 0.704757782996793 2003-01-01 0.701650032968431 2004-01-01 0.702070793337597 2005-01-01 0.697856222282752 2006-01-01 0.724440189124479 2007-01-01 0.745673182807522 2008-01-01 0.780124381346582 2009-01-01 0.711464242949816 2010-01-01 0.655657099279509 2011-01-01 0.506039271501876 2012-01-01 0.625280379870972 2013-01-01 0.645061394482838 2014-01-01 0.665046907362509 2015-01-01 0.652959264293031 2016-01-01 0.650662099175108 2017-01-01 0.619528874376456