Year	Percent change
1980	4.444
1981	9.479
1982	10.986
1983	9.93
1984	8.571
1985	3.535
1986	3.594
1987	5.725
1988	7.759
1989	10.246
1990	10.26
1991	11.238
1992	9.572
1993	8.839
1994	8.782
1995	9.04
1996	6.323
1997	5.819
1998	2.83
1999	-3.981
2000	-3.716
2001	-1.606
2002	-3.047
2003	-2.597
2004	-0.355
2005	0.919
2006	2.014
2007	2.03
2008	4.296
2009	0.577
2010	2.314
2011	5.277
2012	4.064
2013	4.324
2014	4.439
2015	2.995
2016	2.411
2017	1.481
2018	2.408
2019	2.4
2020	2.5
2021	2.4
2022	2.5
2023	2.5
2024	2.5