Year	Percent change
1980	274.878
1981	-37.117
1982	-7.19
1983	3.392
1984	54.387
1985	-32.926
1986	6.193
1987	-14.257
1988	-19.84
1989	-2.562
1990	-14.627
1991	14.205
1992	-3.277
1993	-1.414
1994	-2.941
1995	6.611
1996	-32.467
1997	47.253
1998	-7.828
1999	6.528
2000	-31.287
2001	31.447
2002	27.844
2003	-10.12
2004	-30.194
2005	22.116
2006	-27.691
2007	57.786
2008	-10.415
2009	2.548
2010	-18.846
2011	17.702
2012	2.423
2013	-1.339
2014	4.298
2015	-22.435
2016	22.637
2017	-6.961
2018	11.787
2019	1.158
2020	3.494
2021	3.232
2022	3.086
2023	3.051
2024	2.836