Year Percent Change from Year Ago 1960-01-01 6.272169611767390 1961-01-01 2.677118939257640 1962-01-01 1.102909653488430 1963-01-01 4.874383995781760 1964-01-01 5.533659373538720 1965-01-01 2.142176557992010 1966-01-01 1.573100407055630 1967-01-01 2.786474639949880 1968-01-01 5.441083436819060 1969-01-01 1.924096838899120 1970-01-01 2.710005435999130 1971-01-01 3.484322529791920 1972-01-01 4.301950160883820 1973-01-01 6.508577062454440 1974-01-01 -2.463394368364370 1975-01-01 -1.480255892816790 1976-01-01 2.909301926382900 1977-01-01 2.442910580136810 1978-01-01 4.202218792908580 1979-01-01 3.741692933264790 1980-01-01 -2.028011330425790 1981-01-01 -0.771112370611223 1982-01-01 2.010343667365420 1983-01-01 4.221865564048850 1984-01-01 2.276316132905290 1985-01-01 4.195575914755070 1986-01-01 3.140524543320740 1987-01-01 5.300720113508430 1988-01-01 5.758249729621030 1989-01-01 2.568747673316280 1990-01-01 0.739318856485518 1991-01-01 -1.087898632473930 1992-01-01 0.371025902267534 1993-01-01 2.526346969319030 1994-01-01 3.894958526256580 1995-01-01 2.455304146461230 1996-01-01 2.535266037863120 1997-01-01 4.293074904161050 1998-01-01 3.341279041290470 1999-01-01 3.213785842882680 2000-01-01 3.453462960244320 2001-01-01 2.840765410710140 2002-01-01 2.499726968394410 2003-01-01 3.339456190732000 2004-01-01 2.347792049352600 2005-01-01 3.148724240960000 2006-01-01 2.548078385137060 2007-01-01 2.545500790995760 2008-01-01 -0.345916654107257 2009-01-01 -4.246551567302000 2010-01-01 1.711206446878940 2011-01-01 1.644770016411040 2012-01-01 1.447060441790620 2013-01-01 2.046299584171720 2014-01-01 2.947562167651850 2015-01-01 2.349122689160990 2016-01-01 1.789288662015620 2017-01-01 1.741182133347960