Year	Percent change
1980	5.721
1981	5.656
1982	-2.851
1983	-10.785
1984	6.894
1985	8.408
1986	7.699
1987	25.021
1988	-5.455
1989	-10.889
1990	0.306
1991	4.892
1992	-4.85
1993	-12.67
1994	7.49
1995	6.471
1996	16.62
1997	5.817
1998	23.58
1999	2.598
2000	3.647
2001	-11.236
2002	-2.878
2003	7.619
2004	16.335
2005	26.161
2006	16.283
2007	-5.699
2008	-18.913
2009	-27.682
2010	2.859
2011	6.793
2012	2.279
2013	-0.257
2014	9.307
2015	18.654
2016	13.679
2017	11.488
2018	-3.991
2019	5.664
2020	2.824
2021	0.822
2022	2.793
2023	2.023
2024	2.1