Year	Percent change
1980	22.587
1981	-6.128
1982	11.585
1983	27.321
1984	21.856
1985	-3.246
1986	9.683
1987	-3.749
1988	-2.289
1989	18.441
1990	1.512
1991	13.114
1992	7.006
1993	8.955
1994	-6.383
1995	10.626
1996	4.26
1997	38.936
1998	1.265
1999	23.553
2000	-3.385
2001	23.99
2002	33.012
2003	-11.849
2004	-5.322
2005	16.796
2006	-1.75
2007	-6.056
2008	-4.709
2009	-12.58
2010	-1.015
2011	4.527
2012	8.619
2013	10.735
2014	-0.849
2015	30.742
2016	-3.732
2017	5.925
2018	8.661
2019	0.91
2020	1.158
2021	1.909
2022	2.03
2023	2.161
2024	2.645