Year annual % 1981 -2.1003061669614027 1982 0 1983 0.012763558386637897 1984 0.0011881098994876993 1985 19.035205740794396 1986 -9.013061919943581 1987 9.823311349966303 1988 2.21377444948736 1989 16.27966268538374 1990 14.007439827259248 1991 106.30998226847836 1992 476.51575086326034 1993 917.7834684117635 1994 2175.9789550875926 1995 1825.4951490073122 1996 4800.531644157435 1997 95.45302217911293 1998 39.35934832526931 1999 557.5011130912153 2000 418.0189915340991 2001 106.35212550145093 2002 196.98409939993138 2003 93.92656690673081 2004 33.443594790025514 2005 42.37424926172838 2006 17.115665144854162 2007 4.308432212071821 2008 19.365773555832575 2009 -16.762140290159223 2010 32.27046912244123 2011 31.771460155898637 2012 7.255749909438251 2013 2.8397241263776465 2014 3.5608847720580457 2015 -3.5183853459847825 2016 21.774312558284947 2017 22.61443652413493 2018 28.16709325548908 2019 19.187003827178458 2020 10.763105282479884 2021 38.823721837491775 2022 13.709847520784152 2023 17.64775693195982