Year	Percent change
1980	22.499
1981	0.875
1982	-4.706
1983	13.885
1984	-21.835
1985	-35.191
1986	-3.881
1987	-3.662
1988	3.321
1989	0.181
1990	1.576
1991	2.263
1992	2.487
1993	2.771
1994	0.855
1995	6.441
1996	-7.967
1997	3.397
1998	0.931
1999	-10.465
2000	-0.839
2001	21.85
2002	-9.523
2003	1.735
2004	17.771
2005	-6.1
2006	-6.412
2007	18.58
2008	24.578
2009	6.558
2010	0.505
2011	2.161
2012	9.428
2013	2.81
2014	-1.509
2015	-3.459
2016	7.17
2017	-0.906
2018	3.753
2019	6.3
2020	4.737
2021	0.955
2022	1.172
2023	1.374
2024	1.242