Year Percent Change at Annual Rate 1960-01-01 0.722756593436363 1961-01-01 0.792901846960662 1962-01-01 0.595777103319398 1963-01-01 0.370892005189515 1964-01-01 0.362612546763260 1965-01-01 0.467787696313794 1966-01-01 0.737804081250380 1967-01-01 0.814411517253211 1968-01-01 0.650532889746133 1969-01-01 0.365420762514530 1970-01-01 0.228196508250718 1971-01-01 0.433844787806772 1972-01-01 0.650037188006439 1973-01-01 0.454133111943996 1974-01-01 0.368183314375017 1975-01-01 0.938660353611257 1976-01-01 1.553213562948650 1977-01-01 1.301109488895960 1978-01-01 1.296604358513600 1979-01-01 1.246698066741670 1980-01-01 0.982220016059070 1981-01-01 0.896616062871497 1982-01-01 0.616462040117845 1983-01-01 0.581724932326243 1984-01-01 0.498156576200026 1985-01-01 0.388288979165941 1986-01-01 0.330759073504695 1987-01-01 0.334358494429305 1988-01-01 0.363197987305088 1989-01-01 0.521850980086200 1990-01-01 1.057808011981920 1991-01-01 1.200352536726460 1992-01-01 0.763882722455260 1993-01-01 0.588261919240559 1994-01-01 0.500703437870186 1995-01-01 0.467197289199787 1996-01-01 0.440670530860680 1997-01-01 0.493267144825827 1998-01-01 0.554211902922578 1999-01-01 0.383471311618576 2000-01-01 0.409041838238246 2001-01-01 0.519884463961930 2002-01-01 0.366566462148184 2003-01-01 0.238643175320258 2004-01-01 0.247413542822812 2005-01-01 0.293249074052818 2006-01-01 0.300331800966640 2007-01-01 0.254757581935775 2008-01-01 0.265457836726293 2009-01-01 0.263026401346927 2010-01-01 0.128880432668041 2011-01-01 -0.147951277402184 2012-01-01 -0.540752950543684 2013-01-01 -0.725120806658085 2014-01-01 -0.666113290031891 2015-01-01 -0.658861360878339 2016-01-01 -0.415913028277122 2017-01-01 -0.144406757661553