Year Percent Change at Annual Rate 1960-01-01 3.06307025530353 1961-01-01 3.15374644564972 1962-01-01 3.20699087154695 1963-01-01 3.18440455047800 1964-01-01 3.07110243213984 1965-01-01 2.90321098331290 1966-01-01 2.72756158909755 1967-01-01 2.58320484936702 1968-01-01 2.47387108730545 1969-01-01 2.41221150052012 1970-01-01 2.38619073436101 1971-01-01 2.36319665135881 1972-01-01 2.34001661575908 1973-01-01 2.34288848296267 1974-01-01 2.37426613965886 1975-01-01 2.42285980993638 1976-01-01 2.48903060538555 1977-01-01 2.54693215847759 1978-01-01 2.56653695635672 1979-01-01 2.53655833959047 1980-01-01 2.47954561265371 1981-01-01 2.40392086170079 1982-01-01 2.35493633834527 1983-01-01 2.37630103080203 1984-01-01 2.48599934857777 1985-01-01 2.64588022816610 1986-01-01 2.81971123762262 1987-01-01 2.94807174496049 1988-01-01 2.99539309618043 1989-01-01 2.94194047929704 1990-01-01 2.82441823263092 1991-01-01 2.68631347822277 1992-01-01 2.57468651066597 1993-01-01 2.50478904528410 1994-01-01 2.49204290597014 1995-01-01 2.51333238368248 1996-01-01 2.54222627695985 1997-01-01 2.54543553451593 1998-01-01 2.50999530845298 1999-01-01 2.42506872319902 2000-01-01 2.30944003320102 2001-01-01 2.18971875829380 2002-01-01 2.08745707900568 2003-01-01 2.00422708638318 2004-01-01 1.94702751360450 2005-01-01 1.90936576886761 2006-01-01 1.86934147598468 2007-01-01 1.82792424425726 2008-01-01 1.80597340619073 2009-01-01 1.80686952608076 2010-01-01 1.81960217613464 2011-01-01 1.84274041907181 2012-01-01 1.85222003666272 2013-01-01 1.82170012344616 2014-01-01 1.73957920597507 2015-01-01 1.62473952781179 2016-01-01 1.49932335842914 2017-01-01 1.39148356363892