Year	Percent change
1980	40.979
1981	0.744
1982	9.786
1983	-1.229
1984	-5.491
1985	21.665
1986	-6.475
1987	282.627
1988	-5.875
1989	6.339
1990	3.509
1991	-14.544
1992	-1.841
1993	-3.766
1994	33.828
1995	8.352
1996	-20.274
1997	26.691
1998	5.62
1999	-8.091
2000	3.805
2001	-9.348
2002	-9.458
2003	-22.545
2004	9.449
2005	2.687
2006	4.558
2007	8.833
2008	-1.311
2009	7.559
2010	14.984
2011	-12.49
2012	11.041
2013	-29.146
2014	74.584
2015	18.701
2016	9.706
2017	-2.032
2018	3.956
2019	2.631
2020	3.787
2021	3.644
2022	3.993
2023	4.494
2024	4.314