Year Percent change 1980 15.028 1981 8.058 1982 5.997 1983 6.676 1984 3.942 1985 5.38 1986 -0.394 1987 3.448 1988 9.979 1989 2.632 1990 5.223 1991 5.166 1992 1.715 1993 2.364 1994 10.604 1995 3.486 1996 2.571 1997 6.364 1998 3.553 1999 7.431 2000 9.459 2001 2.673 2002 3.591 2003 -1.691 2004 4.34 2005 5.848 2006 5.322 2007 0.654 2008 2.567 2009 -10.377 2010 6.519 2011 5.811 2012 -0.584 2013 2.362 2014 3.342 2015 4.504 2016 1.919 2017 5.983 2018 2.648 2019 2 2020 1.9 2021 1.9 2022 1.9 2023 1.9 2024 1.9