Year	Percent change
1981	2.5
1982	2
1983	2
1984	2.7
1985	9.3
1986	6.5
1987	7.3
1988	18.8
1989	18
1990	3.1
1991	3.4
1992	6.4
1993	14.7
1994	24.1
1995	17.1
1996	8.3
1997	2.8
1998	-0.8
1999	-1.4
2000	0.4
2001	0.7
2002	-0.8
2003	1.2
2004	3.9
2005	1.8
2006	1.5
2007	4.8
2008	5.9
2009	-0.7
2010	3.3
2011	5.4
2012	2.646
2013	2.624
2014	1.988
2015	1.441
2016	2.003
2017	1.558
2018	2.1
2019	2.278
2020	2.507
2021	2.8
2022	2.9
2023	3
2024	3