Year	Percent change
1980	15.067
1981	1.375
1982	4.107
1983	3.295
1984	3.963
1985	5.988
1986	7.358
1987	9.073
1988	2.916
1989	3.758
1990	4.241
1991	1.423
1992	-0.813
1993	-1.956
1994	1.838
1995	2.196
1996	4.386
1997	4.916
1998	11.808
1999	6.981
2000	5.063
2001	-2.024
2002	3.437
2003	9.464
2004	-0.647
2005	13.273
2006	-3.993
2007	6.123
2008	0.948
2009	-6.613
2010	-0.511
2011	0.765
2012	-1.155
2013	2.351
2014	7.344
2015	6.443
2016	3.736
2017	5.059
2018	4.777
2019	4.218
2020	2.405
2021	2.739
2022	2.729
2023	2.685
2024	2.685