Year	Percent change
1980	22.051
1981	11.944
1982	5.161
1983	5.442
1984	8.169
1985	-3.319
1986	12.859
1987	14.049
1988	29.834
1989	9.727
1990	12.922
1991	8.589
1992	7.218
1993	17.103
1994	18.69
1995	22.207
1996	9.597
1997	10.335
1998	-4.387
1999	7.827
2000	14.43
2001	-3.538
2002	7.499
2003	14.213
2004	19.09
2005	12.495
2006	11.152
2007	8.596
2008	4.835
2009	-7.656
2010	17.439
2011	6.988
2012	1.695
2013	6.02
2014	3.063
2015	5.011
2016	0.818
2017	5.434
2018	5.17
2019	1.553
2020	3.952
2021	3.98
2022	3.923
2023	3.894
2024	3.894