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	40.065
1993	25.741
1994	-3.2
1995	21
1996	-11.4
1997	-0.7
1998	11.7
1999	6.8
2000	10.644
2001	12.562
2002	6.291
2003	15.151
2004	26.243
2005	14.348
2006	15.915
2007	22.616
2008	4.864
2009	-21.508
2010	-0.932
2011	9.935
2012	5.549
2013	4.317
2014	5.16
2015	5.443
2016	4.461
2017	7.466
2018	3.266
2019	5.81
2020	5.185
2021	3.947
2022	3.946
2023	3.863
2024	3.772