Year Percent Change at Annual Rate 1960-01-01 1.327265282059620 1961-01-01 1.070670468258570 1962-01-01 0.948771415246671 1963-01-01 1.171774152211960 1964-01-01 1.840398021097090 1965-01-01 2.762626136302280 1966-01-01 3.756135117560430 1967-01-01 4.486971161739630 1968-01-01 4.753998234864680 1969-01-01 4.478719264687330 1970-01-01 3.885147295209970 1971-01-01 3.261716693165410 1972-01-01 2.793621419306850 1973-01-01 2.450744254025890 1974-01-01 2.286682351520000 1975-01-01 2.258255488447210 1976-01-01 2.215889509346770 1977-01-01 2.171900422044850 1978-01-01 2.273016495239850 1979-01-01 2.543650991622310 1980-01-01 2.908392182366220 1981-01-01 3.296955435700950 1982-01-01 3.598261807104150 1983-01-01 3.742780290310120 1984-01-01 3.697801082019370 1985-01-01 3.527752825936820 1986-01-01 3.356088435800130 1987-01-01 3.219300836708600 1988-01-01 3.057150717066490 1989-01-01 2.874184489981840 1990-01-01 2.691525728460450 1991-01-01 2.486198656845480 1992-01-01 2.318348732122470 1993-01-01 2.279175964394180 1994-01-01 2.399463338060900 1995-01-01 2.616560019716650 1996-01-01 2.864823394561740 1997-01-01 3.052206477233460 1998-01-01 3.136325650448860 1999-01-01 3.086730343109800 2000-01-01 2.953704955727500 2001-01-01 2.805204344715860 2002-01-01 2.696269436873830 2003-01-01 2.629685867802790 2004-01-01 2.621365786217150 2005-01-01 2.650748459744890 2006-01-01 2.682622376309460 2007-01-01 2.697089773450710 2008-01-01 2.704475260031420 2009-01-01 2.700650544494890 2010-01-01 2.688142871406740 2011-01-01 2.675426909058390 2012-01-01 2.662143194098880 2013-01-01 2.639490383596510 2014-01-01 2.606212323423940 2015-01-01 2.565901121579530 2016-01-01 2.523861303505380 2017-01-01 2.484146895575510