Year	Percent change
1980	9
1981	8.8
1982	-2.1
1983	7.2
1984	7.2
1985	27.9
1986	21.5
1987	9.3
1988	12.3
1989	20.2
1990	59.8
1991	10
1992	14.2
1993	11.6
1994	11.6
1995	8.61
1996	10.85
1997	7.127
1998	7.473
1999	4.918
2000	5.092
2001	8.902
2002	6.321
2003	5.862
2004	9.224
2005	8.574
2006	5.794
2007	8.74
2008	9.406
2009	-0.284
2010	5.396
2011	6.2
2012	3.446
2013	4.387
2014	2.947
2015	3.066
2016	4.232
2017	5.677
2018	2.316
2019	3.78
2020	4.132
2021	3.979
2022	4.116
2023	4.218
2024	4.306