Year Percent Change at Annual Rate 1960-01-01 2.472720649331870 1961-01-01 2.091209981830130 1962-01-01 1.751451591134720 1963-01-01 1.618906084212450 1964-01-01 1.782140207750180 1965-01-01 2.135454468344280 1966-01-01 2.498343516088420 1967-01-01 2.742772567641710 1968-01-01 2.886889829451790 1969-01-01 2.899206295275740 1970-01-01 2.815461106889750 1971-01-01 2.732011661797050 1972-01-01 2.653626246329310 1973-01-01 2.503805824161070 1974-01-01 2.274449742644910 1975-01-01 2.002510966806240 1976-01-01 1.705861554017200 1977-01-01 1.450234710053080 1978-01-01 1.297790365242820 1979-01-01 1.282776268215610 1980-01-01 1.362677083102040 1981-01-01 1.471987927142140 1982-01-01 1.551993090525620 1983-01-01 1.595603692861430 1984-01-01 1.582776559548780 1985-01-01 1.532563259101560 1986-01-01 1.470062533378220 1987-01-01 1.426298826203430 1988-01-01 1.412056259243680 1989-01-01 1.437894096285570 1990-01-01 1.485868521359600 1991-01-01 1.545649192900510 1992-01-01 1.580207256373660 1993-01-01 1.556452281094960 1994-01-01 1.457169563473990 1995-01-01 1.309020353157790 1996-01-01 1.142680589334320 1997-01-01 0.999306705781230 1998-01-01 0.898979231343647 1999-01-01 0.859965182990286 2000-01-01 0.863279231849613 2001-01-01 0.880297064193614 2002-01-01 0.881768798643863 2003-01-01 0.861266329984215 2004-01-01 0.807983774873461 2005-01-01 0.733387963709353 2006-01-01 0.654350865015693 2007-01-01 0.589222916413930 2008-01-01 0.543310983774329 2009-01-01 0.524098754386457 2010-01-01 0.524225014712987 2011-01-01 0.530070888643340 2012-01-01 0.531448393800594 2013-01-01 0.529463409935176 2014-01-01 0.520483861451136 2015-01-01 0.506566972080324 2016-01-01 0.492776137047091 2017-01-01 0.481109847789118