Year	Percent change
1980	12.199
1981	5.2
1982	2.4
1983	-22.6
1984	16.9
1985	-14.1
1986	36.3
1987	15
1988	11.9
1989	-14.2
1990	43.1
1991	4.2
1992	4.071
1993	31.644
1994	26.7
1995	11.413
1996	-14.29
1997	-8.262
1998	10.464
1999	-14.957
2000	-7.882
2001	-13.924
2002	11.241
2003	9.864
2004	5.766
2005	-4.939
2006	-5.026
2007	11.714
2008	10.933
2009	-15.804
2010	31.039
2011	19.29
2012	-8.899
2013	12.047
2014	3.94
2015	0.239
2016	-0.378
2017	12.918
2018	4.857
2019	4.019
2020	3.929
2021	3.719
2022	3.693
2023	3.746
2024	3.749