Year	Percent change
1980	6.615
1981	-6.143
1982	16.617
1983	-21.712
1984	-23.231
1985	19.021
1986	-29.919
1987	22.753
1988	-9.967
1989	-2.778
1990	-6.571
1991	-11.164
1992	-10.971
1993	2.932
1994	54.476
1995	-37.1
1996	9.626
1997	-2.517
1998	24.337
1999	-5.794
2000	5.999
2001	6.962
2002	2.036
2003	12.118
2004	4.493
2005	14.35
2006	1.269
2007	6.608
2008	33.663
2009	42.206
2010	12.15
2011	2.561
2012	-3.822
2013	-5.101
2014	1.962
2015	7.797
2016	-9.43
2017	10.235
2018	7.441
2019	18.77
2020	11.803
2021	-0.264
2022	4.425
2023	6.146
2024	5.717