Year	Percent change
1980	-13.199
1981	28.437
1982	-10.689
1983	6.322
1984	19.811
1985	3.773
1986	-30.797
1987	21.713
1988	75.479
1989	-0.171
1990	-66.872
1991	-24.522
1992	9.2
1993	18.4
1994	-16.9
1995	13.3
1996	-8.9
1997	5.3
1998	16.1
1999	7.7
2000	11.749
2001	15.488
2002	13.288
2003	17.364
2004	27.755
2005	19.756
2006	16.803
2007	26.048
2008	4.338
2009	-23.233
2010	8.709
2011	12.312
2012	4.783
2013	4.974
2014	1.543
2015	6.165
2016	4.451
2017	7.065
2018	4.162
2019	5.897
2020	5.261
2021	4.005
2022	4.004
2023	3.931
2024	3.844