Year	Percent change
1980	13.984
1981	-22.402
1982	-4.589
1983	1.793
1984	-6.529
1985	21.783
1986	-26.189
1987	-2.863
1988	20.579
1989	21.257
1990	2.952
1991	-0.441
1992	14.966
1993	-7.781
1994	10.966
1995	-11.184
1996	9.706
1997	22.947
1998	-19.295
1999	14.33
2000	-21.679
2001	-4.852
2002	12.738
2003	6.177
2004	11.973
2005	4.364
2006	6.304
2007	-10.377
2008	37.561
2009	-18.711
2010	42.098
2011	-14.302
2012	-9.507
2013	1.042
2014	8.076
2015	0.592
2016	4.94
2017	0.409
2018	-1.366
2019	7.662
2020	5.604
2021	5.823
2022	6.182
2023	6.329
2024	6.199