Year	Percent change
1981	6.585
1982	5.872
1983	-6.485
1984	-2.073
1985	4.634
1986	18.848
1987	27.402
1988	21.642
1989	8.496
1990	16.121
1991	8.363
1992	10.993
1993	-1.534
1994	10.565
1995	9.436
1996	5.152
1997	3.858
1998	21.976
1999	2.229
2000	-6.743
2001	3.415
2002	3.731
2003	10.685
2004	8.997
2005	-3.376
2006	3.63
2007	9.42
2008	5.577
2009	-16.011
2010	-2.563
2011	-3.497
2012	-12.695
2013	8.516
2014	7.887
2015	8.024
2016	4.664
2017	7.892
2018	6.278
2019	5.229
2020	4.706
2021	4.228
2022	4.139
2023	4.129
2024	4.129