Year	Percent change
1980	-5.277
1981	72.252
1982	-5.335
1983	-18.668
1984	-1.727
1985	-21.44
1986	-10.682
1987	161.202
1988	-19.771
1989	0.333
1990	21.025
1991	-12.509
1992	43.047
1993	-22.607
1994	-16.991
1995	30.633
1996	-8.72
1997	3.93
1998	-8.501
1999	17.505
2000	3.874
2001	1.02
2002	13.941
2003	-16.681
2004	-1.629
2005	23.468
2006	-12.832
2007	-4.415
2008	-2.74
2009	-0.37
2010	-11.411
2011	9.816
2012	17.385
2013	1.105
2014	5.198
2015	14.235
2016	8.538
2017	6.406
2018	4.721
2019	4.661
2020	4.721
2021	4.751
2022	4.685
2023	4.573
2024	4.402