Year	Percent change
1980	17.843
1981	-8.248
1982	-4.05
1983	-4.249
1984	3.796
1985	9.044
1986	-0.033
1987	14.029
1988	34.868
1989	11.077
1990	15.665
1991	5.394
1992	3.026
1993	5.874
1994	7.534
1995	10.032
1996	-5.921
1997	-1.684
1998	2.511
1999	10.125
2000	10.431
2001	-9.157
2002	1.242
2003	4.555
2004	-1.176
2005	5.986
2006	18.433
2007	8.13
2008	19.529
2009	0.303
2010	7.634
2011	-0.511
2012	5.123
2013	0.07
2014	0.35
2015	18.034
2016	1.409
2017	-0.128
2018	0.54
2019	1.85
2020	1.87
2021	1.67
2022	1.65
2023	1.61
2024	1.6