Year	Percent change
1980	5.975
1981	10.1
1982	18.1
1983	-0.3
1984	-0.2
1985	-5.3
1986	-3.4
1987	-9.2
1988	3.6
1989	3
1990	-10.8
1991	-0.9
1992	6.6
1993	5.7
1994	37.1
1995	16
1996	-20.1
1998	4.085
1999	16.597
2000	-5.826
2001	8.446
2002	21.976
2003	19.126
2004	20.324
2005	-4.452
2006	24.073
2007	38.016
2008	3.46
2009	-10.349
2010	3.056
2011	16.628
2012	-20.645
2013	-3.18
2014	12.36
2015	-23.137
2016	18.674
2017	16.57
2018	13.109
2019	7.018
2020	10.457
2021	8.973
2022	9.539
2023	8.891
2024	9.558