Year annual % 1963 18.548387096774192 1964 -2.380952380952381 1965 17.073170731707318 1966 9.077380952380953 1967 7.776261937244201 1968 0.8987341772151899 1969 15.594028352778825 1970 4.145864988061645 1971 26.458941225510628 1972 6.279357231149567 1973 20.214003256571296 1974 31.030701754385966 1975 9.800639921240464 1976 31.081323410741508 1977 28.72191251410787 1978 44.00988389085209 1979 19.012564343514146 1980 20.815117973846895 1981 20.704964520379676 1982 -11.79240770073854 1983 -0.3470883147157483 1984 22.1749226010867 1985 7.009423503325943 1986 11.975279635022181 1987 -5.45868645555472 1988 15.176598367925425 1989 5.802966196527021 1990 -4.0518166740642 1991 -8.860535295515588 1992 -0.9563449795373498 1993 0.07144773138964595 1994 6.725852313857665 1995 3.7519854081704636 1996 -6.584984448301342 1997 -21.31115417622768 1998 -18.47732731343936 1999 15.407949529960351 2000 12.815443568294835 2001 48.61031576245899 2002 -18.46165345801595 2003 44.65517554764052 2004 8.877448115263963 2005 4.767766218008051 2006 11.683112382680603 2007 46.200321159008276 2008 9.382559175503534 2009 20.693362461405933 2010 22.61319706927105 2011 6.840059773257473 2012 31.716388395591956 2013 9.742917318845555 2014 24.913367347675898 2015 4.585238557836406 2016 8.670520213190846 2017 -4.921029625646088 2018 -2.1040139901450354 2019 15.057028029221032 2020 17.014520371113644 2021 9.728741570003281 2022 11.922722513354483 2023 -0.9247925708980719