Year	Percent change
1980	27.877
1981	11.1
1982	-0.81
1983	9.891
1984	0.991
1985	-9.158
1986	9.1
1987	11.7
1988	6.484
1989	7.164
1990	15.542
1991	12.5
1992	16.857
1993	20.126
1994	3.386
1995	5.488
1996	6.244
1997	7.579
1998	-1.41
1999	2.956
2000	-1.178
2001	0.673
2002	0.927
2003	-2.803
2004	6.339
2005	2.46
2006	3.5
2007	6.795
2008	12.028
2009	4.545
2010	6.159
2011	11.258
2012	10.889
2013	3.797
2014	2.122
2015	1.891
2016	0.801
2017	2.272
2018	1.473
2019	2.213
2020	2.308
2021	2.464
2022	2.541
2023	2.344
2024	2.015