Year	Percent change
1980	13.3
1981	14.66
1982	13.243
1983	14.558
1984	2.604
1985	10.457
1986	2.411
1987	-6.986
1988	-3.934
1989	0.645
1990	-0.203
1991	-2.848
1992	-0.757
1993	-2.909
1994	24.55
1995	19.2
1996	3.723
1997	1.597
1998	-1.871
1999	-1.415
2000	3.202
2001	3.843
2002	2.298
2003	4.353
2004	-2.244
2005	2.885
2006	6.694
2007	0.935
2008	9.262
2009	3.522
2010	1.491
2011	1.195
2012	5.874
2013	6.552
2014	11.6
2015	4.5
2016	4.6
2017	4.1
2018	3
2019	3
2020	2.5
2021	2.5
2022	2.5
2023	2.5
2024	2.402