Year	Percent change
1980	-14.005
1981	1.875
1982	1.516
1983	23.98
1984	-4.129
1985	-20.193
1986	-32.585
1987	-8.154
1988	-46.841
1989	71.867
1990	6.5
1991	-55.7
1992	37.6
1993	39
1994	-12.892
1995	34.424
1996	22.586
1997	16.227
1998	4.075
1999	36.066
2000	149.67
2001	7.956
2002	11.146
2003	13.07
2004	14.749
2005	-7.8
2006	-0.949
2007	40.373
2008	-4.136
2009	4.118
2010	6.43
2011	-33.658
2012	-64.907
2013	47.795
2014	-8.19
2015	-0.593
2016	-1.448
2017	-5.614
2018	-6.593
2019	-3.312
2020	-3.001
2021	-2.415
2022	0.617
2023	2.945
2024	2.942