Year	Percent change
1980	-28.942
1981	-29.925
1982	22.205
1983	11.909
1984	16.191
1985	21.989
1986	5.365
1987	18.568
1988	-8.306
1989	-39.838
1990	172.249
1991	50
1992	5
1993	64.618
1994	36.357
1995	31.643
1996	19.541
1997	-3.345
1998	0.862
1999	-5.478
2000	3.276
2001	5.423
2002	22.271
2003	23.797
2004	21.832
2005	6.692
2006	17.692
2007	33.621
2008	17.788
2009	-6.558
2010	4.247
2011	-3.159
2012	10.853
2013	16.315
2014	12.677
2015	15.956
2016	13.068
2017	19.232
2018	9.953
2019	13.59
2020	12.475
2021	12.496
2022	12.647
2023	12.563
2024	12.476