Year Percent change 1980 14.151 1981 8.678 1982 7.119 1983 4.374 1984 3.688 1985 10.852 1986 18.664 1987 53.418 1988 7.34 1989 0.758 1990 21.766 1991 10.488 1992 21.311 1993 79.263 1994 142.841 1995 24.162 1996 2.84 1997 6.081 1998 11.248 1999 60.526 2000 29.557 2001 34.366 2002 15.516 2003 23.001 2004 9.126 2005 13.981 2006 11.281 2007 6.426 2008 14.667 2009 -0.3 2010 6.948 2011 17.684 2012 5.009 2013 1.916 2014 3.384 2015 6.896 2016 55.501 2017 22.024 2018 6.939 2019 5.408 2020 5.339 2021 9.28 2022 4.196 2023 3.478 2024 3.48