Year	Percent change
1980	1.128
1981	40.454
1982	12.544
1983	-3.103
1984	-3.414
1985	-17.393
1986	25.504
1987	2.625
1988	-0.371
1989	15.791
1990	-32.59
1991	-0.094
1992	-40.104
1993	42.705
1994	-37.899
1995	4.629
1996	1.312
1997	26.305
1998	12.019
1999	14.28
2000	9.26
2001	5.105
2002	5.822
2003	-7.415
2004	13.961
2005	58.278
2006	-14.853
2007	4.163
2008	15.798
2009	-6.475
2010	21.003
2011	30.922
2012	-7.699
2013	-5.514
2014	6.176
2015	20.22
2016	4.723
2017	-6.212
2018	-2.547
2019	-9.295
2020	-3.074
2021	-0.253
2022	4.459
2023	4.619
2024	3.796