Year	Percent change
1980	13.4
1981	3.447
1982	10.811
1983	-21.696
1984	-14.864
1985	-14.9
1986	34.103
1987	6.637
1988	8.391
1989	4.092
1990	3.005
1991	2.695
1992	-3.488
1993	14.65
1994	7.627
1995	-27.855
1996	9.339
1997	0.897
1998	42.875
1999	16.288
2000	-8.748
2001	9.887
2002	30.387
2003	1.897
2004	-4.425
2005	10.522
2006	5.776
2007	0.019
2008	13.548
2009	6.791
2010	-4.419
2011	45.89
2012	63.701
2013	8.283
2014	-2.319
2015	-1.907
2016	-20.753
2017	-0.648
2018	15.322
2019	32.763
2020	21.024
2021	2.031
2022	18.574
2023	-0.645
2024	-8.355