Year	Percent change
1980	21.258
1981	21.614
1982	6.003
1983	2.658
1984	5.228
1985	-24.039
1986	22.11
1987	-4.87
1988	-0.691
1989	5.091
1990	-34.132
1991	0.32
1992	-38.605
1993	39.092
1994	-32.71
1995	1.457
1996	9.964
1997	15.277
1998	30.857
1999	8.568
2000	-10.145
2001	1.263
2002	12.406
2003	12.516
2004	6.556
2005	48.742
2006	-14.183
2007	9.603
2008	21.827
2009	-10.042
2010	26.639
2011	31.124
2012	-6.168
2013	-7.71
2014	4.521
2015	14.893
2016	3.021
2017	-3.254
2018	0.561
2019	-8.346
2020	-3.93
2021	-3.291
2022	0.585
2023	4.561
2024	3.734