Year	Percent change
1980	-17.031
1981	-24.3
1982	7.3
1983	-15.4
1984	25.2
1985	0.3
1986	34.5
1987	4.7
1988	38.3
1989	8
1990	29.2
1991	2
1992	-4.097
1993	39.598
1994	6.464
1995	16.858
1996	-5.706
1997	-0.456
1998	9.36
1999	-14.841
2000	-5.13
2001	-9.356
2002	-2.595
2003	13.466
2004	5.279
2005	25.963
2006	16.616
2007	6.029
2008	-8.108
2009	-6.931
2010	21.835
2011	0.497
2012	-7.777
2013	15.027
2014	-4.551
2015	3.314
2016	10.492
2017	8.447
2018	-1.66
2019	0.076
2020	5.776
2021	3.149
2022	3.177
2023	3.121
2024	3.02