Year	Percent change
1980	35.974
1981	-5.617
1982	28.12
1983	-7.15
1984	12.394
1985	-7.328
1986	-4.838
1987	-6.977
1988	-5.312
1989	-2.186
1990	36.78
1991	-26.36
1992	-62.153
1993	74.917
1994	-21.955
1995	31.812
1996	9.681
1997	25.533
1998	52.026
1999	15.125
2000	-1.994
2001	-4.765
2002	-9.031
2003	17.804
2004	6.896
2005	16.525
2006	5.308
2007	2.554
2008	-11.344
2009	13.873
2010	-0.122
2011	31.021
2012	-1.643
2013	21.71
2014	5.56
2015	8.804
2016	2.563
2017	-0.979
2018	1.508
2019	2.696
2020	3.774
2021	3.655
2022	3.447
2023	3.342
2024	1.989