Year	Percent change
1981	-6.057
1982	13.111
1983	-25.081
1984	-21.294
1985	76.225
1986	51.084
1987	3.612
1988	-12.146
1989	-15.761
1990	37.291
1991	-19.011
1992	9.656
1993	18.6
1994	-59.412
1995	61.014
1996	35.714
1997	-12.052
1998	58.547
1999	-11.355
2000	-22.746
2001	10.164
2002	16.672
2003	40.532
2004	24.792
2005	8.96
2006	8.834
2007	25.692
2008	35.951
2009	-10.746
2010	34.102
2011	56.157
2012	25.651
2013	45.258
2014	-15.408
2015	-2.18
2016	28.031
2017	34.611
2018	12.695
2019	3.568
2020	6.706
2021	9.739
2022	8.731
2023	8.29
2024	15.304