Year Percent change 1980 17.984 1981 9.172 1982 6.83 1983 16.657 1984 31.255 1985 29.7 1986 24.4 1987 11.2 1988 8.2 1989 16.12 1990 24.779 1991 51.071 1992 77.297 1993 22.07 1994 35.063 1995 19.909 1996 26.407 1997 9.658 1998 8.632 1999 5.982 2000 4.593 2001 9.509 2002 8.224 2003 9.942 2004 14.842 2005 13.419 2006 8.924 2007 9.17 2008 22.007 2009 9.578 2010 12.613 2011 7.526 2012 6.895 2013 9.356 2014 8.275 2015 3.683 2016 2.349 2017 4.383 2018 3.733 2019 3.636 2020 4.93 2021 5 2022 5 2023 5 2024 5