Year	Percent change
1981	-15.188
1982	-29.006
1983	-23.974
1984	-19.878
1985	4.531
1986	24.041
1987	18.534
1988	-28.907
1989	28.052
1990	13.419
1991	-15.368
1992	-2.112
1993	44.102
1994	-1.59
1995	-18.941
1996	34.577
1997	-61.377
1998	16.371
1999	-4.699
2000	53.149
2001	27.674
2002	51.058
2003	6.452
2004	-21.056
2005	18.682
2006	-5.625
2007	-6.522
2008	7.255
2009	15.385
2010	39.355
2011	113.234
2012	17.275
2013	-17.739
2014	6.73
2015	-5.777
2016	-23.993
2017	19.832
2018	2.097
2019	5.042
2020	4.993
2021	5.022
2022	0.82
2023	6.08
2024	3.352