Year	Percent change
1980	-7.733
1981	0.181
1982	53.961
1983	10.432
1984	-12.378
1985	-1.469
1986	-2.389
1987	52.515
1988	-0.626
1989	2.629
1990	-2.245
1991	16.939
1992	13.665
1993	19.445
1994	45.425
1995	37.928
1996	28.693
1997	-8.657
1998	-9.32
1999	14.715
2000	8.203
2001	26.155
2002	4.613
2003	1.734
2004	24.554
2005	12.194
2006	12.162
2007	20.703
2008	14.913
2009	6.07
2010	-12.216
2011	-8.347
2012	18.454
2013	4.809
2014	-5.102
2015	6.272
2016	12.509
2017	9.862
2018	7.259
2019	7.531
2020	9.931
2021	10.037
2022	8.662
2023	15.511
2024	20.533