Year	Percent change
1980	-12.75
1981	14.999
1982	-22.399
1983	9.2
1984	9.705
1985	-2.239
1986	2.7
1987	2.43
1988	12.997
1989	1.645
1990	-7.989
1991	-1.398
1992	3.356
1993	50.34
1994	10.569
1995	6.966
1996	7.22
1997	21.943
1998	9.53
1999	11.996
2000	15.091
2001	-2.881
2002	-1.284
2003	7.439
2004	0.268
2005	4.238
2006	2.969
2007	3.718
2008	-10.66
2009	-13.523
2010	41.288
2011	5.392
2012	4.145
2013	11.262
2014	10.626
2015	5.314
2016	8.883
2017	3.981
2018	5.432
2019	2.463
2020	5
2021	4.768
2022	4.73
2023	4.79
2024	5.011