Year	Percent change
1981	-16.967
1982	-28.292
1983	-19.389
1984	-14.481
1985	7.418
1986	28.664
1987	16.461
1988	-32.295
1989	19.042
1990	32.51
1991	-12.688
1992	-2.628
1993	31.932
1994	3.63
1995	0.934
1996	28.341
1997	-61.368
1998	13.704
1999	42.934
2000	29.181
2001	16.993
2002	18.996
2003	5.246
2004	-18.949
2005	11.039
2006	-6.707
2007	-4
2008	7.028
2009	14.139
2010	62.114
2011	86.006
2012	17.205
2013	-6.446
2014	29.207
2015	-25.49
2016	-19.943
2017	18.845
2018	-4.577
2019	9.805
2020	4.681
2021	3.495
2022	2.327
2023	6.54
2024	4.278