Year annual % 1977 25.993617638526256 1978 11.39673037071149 1979 64.52802420855072 1980 19.028116284328753 1981 -4.374736131047877 1982 8.451288753101572 1983 28.745318352059922 1984 16.64505928853755 1985 51.1019545121852 1986 8.749551489056334 1987 67.1725753501493 1988 21.2157694774757 1989 46.3153524268525 1990 -13.985811656697733 1991 41.567640647135306 1992 13.250749378564116 1993 -14.435922161656183 1994 12.809570515117793 1995 12.257088277954963 1996 18.77857876941867 1997 28.642734656898245 1998 39.43031083436334 1999 26.333090567925986 2000 1.3863679125208903 2001 72.39275671267457 2002 23.263314528124855 2003 14.3146037617422 2004 10.70973820269237 2005 14.402861409370015 2006 8.961909989615688 2007 31.459764066120393 2008 21.46093671863407 2009 -1.3026323959267634 2010 10.701632266549312 2011 4.440318982653849 2012 9.994029659315922 2013 8.434674304838273 2014 4.593309028755295 2015 19.875498242594634 2016 5.39107685227757 2017 2.7169471803119145 2018 8.31894664818532 2019 7.990081267409497 2020 5.892459913249164 2021 5.020386515340992 2022 6.785830958469387 2023 9.23193441568055