Year	Percent change
1980	13.039
1981	-10.568
1982	14.494
1983	-4.552
1984	14.735
1985	-3.719
1986	-7.919
1987	-45.62
1988	-10.517
1989	14.154
1990	-3.553
1991	38.802
1992	-3.904
1993	9.168
1994	-0.976
1995	18.906
1996	-13.505
1997	7.182
1998	3.482
1999	-11.042
2000	15.818
2001	8.396
2002	8.837
2003	2.908
2004	17.913
2005	8.737
2006	13.562
2007	14.077
2008	5.605
2009	-1.832
2010	-9.856
2011	-3.719
2012	-15.71
2013	10.205
2014	-5.969
2015	8.269
2016	4.707
2017	10.98
2018	9.214
2019	12.88
2020	8.66
2021	5.412
2022	2.553
2023	1.235
2024	4.346