Year Percent Change at Annual Rate 1960-01-01 0.821312745002267 1961-01-01 0.890738719527700 1962-01-01 0.953779046282942 1963-01-01 1.015844345251680 1964-01-01 1.040792544773410 1965-01-01 1.068341396313650 1966-01-01 1.065652627313980 1967-01-01 1.067185707287760 1968-01-01 1.060128472238080 1969-01-01 1.044006499668340 1970-01-01 1.015893863136390 1971-01-01 0.998325273514111 1972-01-01 0.976323362884023 1973-01-01 0.894750652950079 1974-01-01 0.764359350458297 1975-01-01 0.581523830631629 1976-01-01 0.384498947943956 1977-01-01 0.221185913817682 1978-01-01 0.162625294607883 1979-01-01 0.236786712589920 1980-01-01 0.406402960256753 1981-01-01 0.597996284203541 1982-01-01 0.770779225310384 1983-01-01 0.901455546332457 1984-01-01 0.984041110956913 1985-01-01 1.017807112097480 1986-01-01 1.057109584609850 1987-01-01 1.092874901871060 1988-01-01 1.070205883486520 1989-01-01 0.967179156527122 1990-01-01 0.814419867650512 1991-01-01 0.635633643913980 1992-01-01 0.486214342114316 1993-01-01 0.393578383507431 1994-01-01 0.394825165331848 1995-01-01 0.460634707963564 1996-01-01 0.542104313316863 1997-01-01 0.609892302967282 1998-01-01 0.653932409051098 1999-01-01 0.690318615223889 2000-01-01 0.700379365944637 2001-01-01 0.715537794535472 2002-01-01 0.736965163775657 2003-01-01 0.750649694440322 2004-01-01 0.741792607497891 2005-01-01 0.731145764820099 2006-01-01 0.721334717452362 2007-01-01 0.706585312379258 2008-01-01 0.680053815741932 2009-01-01 0.646461275217136 2010-01-01 0.614740577736012 2011-01-01 0.572362049666503 2012-01-01 0.535024811703333 2013-01-01 0.508133059278227 2014-01-01 0.485316915399181 2015-01-01 0.482972961342561 2016-01-01 0.477005098801943 2017-01-01 0.468691646361200