Year	Percent change
1980	-83.637
1981	107.614
1982	-36.81
1983	57.435
1984	188.394
1985	-62.913
1986	-66.207
1987	416.499
1988	-4.67
1989	-3.826
1990	-38.201
1991	83.486
1992	-20.365
1993	-17.85
1994	25.402
1995	34.8
1996	-39.968
1997	17.827
1998	4.364
1999	32.271
2000	-58.827
2001	13.55
2002	-0.702
2003	-28.272
2004	-24.343
2005	61.648
2006	-38.988
2007	191.842
2008	-24.938
2009	-13.254
2010	-24.556
2011	50.466
2012	-11.196
2013	-18.48
2014	46.598
2015	-20.172
2016	14.446
2017	-18.131
2018	17.193
2019	-4.851
2020	0
2022	0
2023	0
2024	0