Year	Percent change
1980	-61.845
1981	46.724
1982	18.102
1983	-10.893
1984	-67.9
1985	241.505
1986	30.045
1987	-51.642
1988	113.545
1989	-15.136
1990	-14.113
1991	55.235
1992	-15.891
1993	20.322
1994	-36.037
1995	20.315
1996	-31.901
1997	35.428
1998	9.451
1999	-22.914
2000	-2.639
2001	-20.148
2002	11.064
2003	-33.662
2004	-4.602
2005	10.765
2006	12.05
2007	17.163
2008	-36.137
2009	27.184
2010	20.313
2011	-24.302
2012	-28.069
2013	25.602
2014	50.395
2015	-21.022
2016	32.277
2017	-0.851
2018	-10.199
2019	4.694
2020	4.814
2021	5.017
2022	5.427
2023	5.939
2024	6.505