Year	Percent change
1980	-64.173
1981	34.9
1982	-15.1
1983	20.5
1984	16.4
1985	1.3
1986	-22.8
1987	8.7
1988	-11.5
1989	-6.4
1990	0.8
1991	-12.3
1992	-9.7
1993	16
1994	48.4
1995	25.1
1996	12.1
1997	0
1998	0
1999	5.856
2000	16.731
2001	21.175
2002	22.074
2003	14.757
2004	4.461
2005	9.583
2006	32.967
2007	19.736
2008	1.726
2009	-10.278
2010	2.246
2011	7.038
2012	3.686
2013	13.334
2014	2.118
2015	-6.838
2016	16.229
2017	6.28
2018	11.614
2019	8.841
2020	9.178
2021	7.749
2022	8.922
2023	7.829
2024	8.595