Year	Percent change
1981	-6.89
1982	6.698
1983	-25.409
1984	-19.558
1985	59.414
1986	51.261
1987	6.079
1988	-15.986
1989	-15.949
1990	44.811
1991	-11.27
1992	0.948
1993	15.52
1994	-58.41
1995	59.487
1996	26.358
1997	-11.605
1998	54.935
1999	-13.605
2000	-21.836
2001	9.506
2002	16.766
2003	47.201
2004	23.999
2005	11.939
2006	10.147
2007	26.116
2008	36.788
2009	-9.186
2010	41.531
2011	55.517
2012	24.18
2013	42.23
2014	-15.095
2015	-0.968
2016	26.815
2017	31.262
2018	13.285
2019	2.834
2020	6.679
2021	11.653
2022	9.418
2023	8.96
2024	14.998