Year	Percent change
1980	16.228
1981	3.03
1982	10.28
1983	38.073
1984	25.801
1985	35.424
1986	-15.231
1987	-4.881
1988	10.325
1989	0.602
1990	8.101
1991	11.617
1992	-2.379
1993	-0.605
1994	-4.906
1995	20.417
1996	-10.431
1997	12.505
1998	6.381
1999	5.169
2000	-0.642
2001	25.87
2002	-5.145
2003	16.896
2004	38.054
2005	7.342
2006	15.013
2007	3.237
2008	24.444
2009	-11.993
2010	16.343
2011	8.316
2012	7.544
2013	1.993
2014	12.561
2015	49.864
2016	13.336
2017	4.296
2018	4.452
2019	4.734
2020	4.663
2021	4.575
2022	4.733
2023	4.937
2024	4.206