Year annual % 1961 -4.498232871584747 1962 -1.7483859850474204 1963 -1.9001024877755555 1964 0.626693254367126 1965 -1.5726706863673314 1966 -1.7397892447326768 1967 0.01835570371395079 1968 -0.23719076577285136 1969 -2.1896122885350877 1970 1.558780762965469 1971 10.02901101083738 1972 9.099445695031633 1973 33.62089989216989 1974 58.329955284966616 1975 13.313723899841861 1976 15.008237180942956 1977 21.88781914078494 1978 10.85974748595811 1979 31.73047088793811 1980 35.231313493968344 1981 26.273837095337058 1982 7.372944053656141 1983 15.432989914310525 1984 17.748647990171634 1985 4.054488148005902 1986 12.23554339671334 1987 21.533419014583345 1988 20.080299327396347 1989 17.160007882483555 1990 22.797196956027193 1991 25.617113205687872 1992 29.34153256369484 1993 49.89681486561935 1994 33.93148659912865 1995 37.93749450801934 1996 28.833645723895756 1997 15.52808649572161 1998 9.381517157785595 1999 31.707847144876354 2000 24.92926051730528 2001 14.80541895269991 2002 28.279694089381763 2003 13.136394615760793 2004 24.708242390054735 2005 20.16619160846882 2006 14.582593024432327 2007 22.939061358698055 2008 19.42198086490548 2009 4.5985169132210615 2010 15.882625978133987 2011 33.409533154123864 2012 18.953884144828194 2013 36.775631886208004 2014 9.758768732563269 2015 0.19700167873683938 2016 9.39978461338336 2017 13.035331167157935 2018 31.6411842965085 2019 30.53486622726561 2020 44.26498363374242 2021 56.319654643966544 2022 50.58524806250503 2023 32.909284977024754