Year	Percent change
1981	23.645
1982	-0.373
1983	6.554
1984	0.527
1985	-4.983
1986	-4.232
1987	0.192
1988	-4.602
1989	1.608
1990	-2.572
1991	-6.904
1992	-2.617
1993	3.471
1994	40.584
1995	7.644
1996	3.634
1997	4.113
1998	3.357
1999	-1.877
2000	4.626
2001	3.178
2002	0.579
2003	-1.639
2004	3.896
2005	4.158
2006	0.362
2007	4.679
2008	13.64
2009	-3.131
2010	1.418
2011	1.442
2012	0.667
2013	1.141
2014	-0.627
2015	2.197
2016	-2.204
2017	4.775
2018	1.618
2019	2.24
2020	2
2021	2
2022	2
2023	2
2024	2