Year	Percent change
1980	20.017
1981	36.797
1982	23.123
1983	-8.882
1984	-8.77
1985	-6.008
1986	10.116
1987	4.906
1988	3.758
1989	-2.659
1990	9.149
1991	-21.17
1992	24.766
1993	44.869
1994	16.759
1995	6.719
1996	1.389
1997	18.612
1998	1.123
1999	-23.694
2000	15.145
2001	8.74
2002	0.329
2003	8.17
2004	10.272
2005	11.902
2006	18.838
2007	13.498
2008	12.061
2009	-8.647
2010	10.83
2011	21.995
2012	9.373
2013	7.399
2014	7.762
2015	-1.081
2016	-3.541
2017	1.198
2018	6.769
2019	4.511
2020	5.854
2021	3.226
2022	4.186
2023	4.411
2024	4.078