Year	Percent change
1980	25.654
1981	-1.797
1982	-1.67
1983	3.891
1984	0.17
1985	-3.132
1986	4.188
1987	14.002
1988	28.27
1989	-16.84
1990	-25.624
1991	13.246
1992	-8.836
1993	13.549
1994	-2.189
1995	1.551
1996	-25.024
1997	7.497
1998	-34.514
1999	-17.221
2000	-22.473
2001	-14.402
2002	-22.112
2003	-1.179
2004	14.055
2005	54.045
2006	25.805
2007	25.435
2008	-7.204
2009	-2.921
2010	36.833
2011	3.562
2012	2.698
2013	6.779
2014	1.393
2015	11.359
2016	-1.751
2017	2.416
2018	5.585
2019	10.622
2020	4.799
2021	0.221
2022	1.432
2023	6.31
2024	13.889