Year	Percent change
1980	23.457
1981	20.576
1982	-14.26
1983	-9.882
1984	-4.655
1985	-1.99
1986	-2.659
1987	4.914
1988	-5.888
1989	-1.632
1990	-0.263
1991	-2.787
1992	11.465
1993	-9.185
1994	9.921
1995	0.2
1996	24.643
1997	-4.373
1998	11.021
1999	-12.898
2000	43.227
2001	5.709
2002	-8.578
2003	6.542
2004	9.259
2005	-5.091
2006	1.982
2007	-5.011
2008	-3.453
2009	14.583
2010	20.873
2011	-16.588
2012	23.647
2013	12.77
2014	21.58
2015	-2.741
2016	-4.067
2017	15.32
2018	1.873
2019	10.526
2020	9.212
2021	5.319
2022	60.639
2023	17.053
2024	3.984