Year	Percent change
1980	13.739
1981	22.364
1982	10.872
1983	-7.01
1984	-0.783
1985	-2.333
1986	11.876
1987	1.553
1988	-13.299
1989	-14.551
1990	67.848
1991	3.848
1992	-54.153
1993	57.583
1994	-33.723
1995	153.296
1996	-7.179
1997	15.024
1998	29.99
1999	20.051
2000	-3.622
2001	1.875
2002	-7.525
2003	5.615
2004	-3.002
2005	-2.723
2006	9.927
2007	2.233
2008	7.358
2009	10.199
2010	33.27
2011	-3.671
2012	-6.806
2013	10.509
2014	11.835
2015	11.158
2016	-2.087
2017	10.371
2018	6.115
2019	3.051
2020	-4.494
2021	3.161
2022	2.52
2023	3.042
2024	0.617