Year annual % 1961 0.802690192184129 1962 0.651595835691077 1963 0.647377535798313 1964 0.643086645958438 1965 0.592612643075023 1966 0.961514846201681 1967 1.64542826578947 1968 1.3504476706304 1969 1.05158168279261 1970 1.19852285419382 1971 1.03738983756395 1972 0.955222600818755 1973 0.85663776612112 1974 0.925588793249952 1975 1.24829220616137 1976 1.20458776216374 1977 0.944235678563911 1978 0.893984020893602 1979 0.631327429634966 1980 0.527314447799743 1981 0.654341869540002 1982 0.547287797531317 1983 0.376306456784292 1984 0.35427994718411 1985 0.407515550779296 1986 0.455749591132157 1987 0.491803435719855 1988 0.470502241971901 1989 0.449148207465758 1990 0.17417662808295 1991 -0.868693831241648 1992 -0.9034629284532 1993 -0.136109142211483 1994 -0.14537906455364 1995 -0.20231879638046 1996 -0.288129485530899 1997 -0.287897951541563 1998 -0.206980241940766 1999 -0.156978616024445 2000 -0.129440039806255 2001 -1.39542998635748 2002 -1.83065499370162 2003 -0.7212622974018 2004 -0.569786272532879 2005 -0.61753095660306 2006 -0.592402560029107 2007 -1.47722298197717 2008 -1.66638264306554 2009 -0.833088754778975 2010 -0.593959183588628 2011 -0.491866212866043 2012 -0.445177936198383 2013 -0.371323062878035 2014 -0.374575497762261 2015 -0.470052227864654 2016 -0.573660845379617 2017 -0.578007015146885 2018 -0.587493307403584 2019 -0.526814821936341 2020 -0.550759892541776 2021 -0.746036478523061 2022 -0.393250873813944 2023 0.047801854432771