Year	Percent change
1981	1.615
1982	-3.775
1983	0.851
1984	1.085
1985	7.828
1986	2.666
1987	2.914
1988	0.466
1989	1.83
1990	-4.256
1991	-6.096
1992	0.247
1993	20.244
1994	8.844
1995	15.591
1996	9.396
1997	23.093
1998	23.784
1999	13.305
2000	20.294
2001	5.306
2002	6.78
2003	9.288
2004	17.284
2005	7.847
2006	15.506
2007	13.905
2008	6.027
2009	-14.72
2010	10.154
2011	4.435
2012	-3.484
2013	4.512
2014	10.971
2015	6.449
2016	2.937
2017	6.874
2018	7.704
2019	7.395
2020	7.31
2021	6.903
2022	6.801
2023	6.079
2024	6