Year	Percent change
1980	2.978
1981	7.116
1982	-0.57
1983	-9.696
1984	9.145
1985	9.419
1986	0.949
1987	23.265
1988	-4.585
1989	-10.257
1990	0.991
1991	5.259
1992	-5.972
1993	-7.501
1994	3.821
1995	3.617
1996	16.474
1997	8.015
1998	21.943
1999	3.353
2000	7.803
2001	-9.987
2002	-2.732
2003	10.252
2004	13.742
2005	28.817
2006	9.821
2007	-2.263
2008	-20.312
2009	-22.369
2010	4.408
2011	6.771
2012	4.604
2013	0.134
2014	9.781
2015	13.786
2016	14.491
2017	12.458
2018	0.148
2019	3.794
2020	3.283
2021	2.071
2022	2.796
2023	2.214
2024	2.261