Year	Percent change
1980	12.1
1981	5.8
1982	5.9
1983	-7.4
1984	-2.1
1985	2.8
1986	18.5
1987	27.6
1988	22.4
1989	8.3
1990	15.6
1991	7.2
1992	13.5
1993	-5.8
1994	11.3
1995	9.7
1996	8.4
1997	4.846
1998	22.217
1999	3.395
2000	-6.423
2001	3.977
2002	3.292
2003	10.757
2004	9.48
2005	-3.578
2006	2.877
2007	8.957
2008	5.681
2009	-18.223
2010	-1.923
2011	-4.089
2012	-12.577
2013	8.215
2014	6.86
2015	7.697
2016	3.811
2017	8.142
2018	7.006
2019	4.821
2020	4.257
2021	4.2
2022	4.1
2023	4.1
2024	4.1