Year Percent Change at Annual Rate 1960-01-01 0.34612886978733900 1961-01-01 0.76045993852192100 1962-01-01 0.84866138773187300 1963-01-01 0.74836644871730500 1964-01-01 0.65025774875668500 1965-01-01 0.64246877944355900 1966-01-01 0.55130324946533000 1967-01-01 0.53854376954225800 1968-01-01 0.48676827963926600 1969-01-01 0.41580326948498600 1970-01-01 0.39872245794476000 1971-01-01 0.41766661747401700 1972-01-01 0.33905751571820000 1973-01-01 0.19319818644469000 1974-01-01 0.06305921015315560 1975-01-01 -0.00742336272019876 1976-01-01 -0.02460383253032800 1977-01-01 -0.03287384823902690 1978-01-01 0.00535990765712166 1979-01-01 0.08972866119182310 1980-01-01 0.11951725412901900 1981-01-01 0.03482173205611830 1982-01-01 -0.03584279383483340 1983-01-01 0.03410137387615320 1984-01-01 0.15826186320409600 1985-01-01 0.22695122545000100 1986-01-01 0.23161022983433700 1987-01-01 0.21263726069970900 1988-01-01 0.22206389396178500 1989-01-01 0.26031145007826200 1990-01-01 0.29893055409587600 1991-01-01 0.30924793231938100 1992-01-01 0.27043118208187700 1993-01-01 0.23974543928647900 1994-01-01 0.25458648685891200 1995-01-01 0.26454741685870200 1996-01-01 0.25462638421508600 1997-01-01 0.25755332328035100 1998-01-01 0.29140608543239200 1999-01-01 0.33340588218441600 2000-01-01 0.35730088742160500 2001-01-01 0.38497596956422800 2002-01-01 0.42333707963628100 2003-01-01 0.46564111360299300 2004-01-01 0.56894311342131700 2005-01-01 0.68661130607346000 2006-01-01 0.73504867842129000 2007-01-01 0.77866611244125600 2008-01-01 0.78703262231893900 2009-01-01 0.75639085959340700 2010-01-01 0.78388864664651600 2011-01-01 0.78167728929868400 2012-01-01 0.69531584271138800 2013-01-01 0.66953380745659800 2014-01-01 0.75334949939854400 2015-01-01 0.79496790929526700 2016-01-01 0.71403026526199300 2017-01-01 0.64840678360148700