Year	Percent change
1980	-7.821
1981	9.94
1982	-2.262
1983	-63.156
1984	-74.252
1985	528.745
1986	126.56
1987	-5.382
1988	35.066
1989	-19.14
1990	17.853
1991	3.24
1992	18.933
1993	2.606
1994	2.456
1995	8.984
1996	-3.244
1997	12.979
1998	-4.733
1999	-17.861
2000	7.563
2001	3.023
2002	-12.047
2003	-4.815
2004	18.364
2005	17.238
2006	10.93
2007	15.104
2008	14.65
2009	-1.258
2010	1.622
2011	25.838
2012	3.516
2013	-10.368
2014	-15.881
2015	-0.059
2016	-18.505
2017	2.749
2018	7.415
2019	7.029
2020	7.686
2021	5.265
2022	4.011
2023	4.132
2024	4.283