Year	Percent change
1980	21.45
1981	9.463
1982	0.553
1983	1.324
1984	1.534
1985	0.99
1986	4.51
1987	5.066
1988	1.607
1989	3.779
1990	6.012
1991	6.31
1992	3.156
1993	0.728
1994	5.857
1995	4.645
1996	-2.285
1997	1.937
1998	3.604
1999	1.999
2000	6.892
2001	2.974
2002	-0.676
2003	0.51
2004	3.499
2005	5.18
2006	0.675
2007	6.794
2008	3.404
2009	-3.091
2010	4.226
2011	4.784
2012	5.009
2013	-0.74
2014	3.669
2015	-2.602
2016	-2.835
2017	1.98
2018	2.019
2019	2.008
2020	2.139
2021	2
2022	2
2023	2
2024	2