Year	Percent change
1981	-0.498
1982	4.2
1983	-3.4
1984	5.5
1985	4.3
1986	-1
1987	5.6
1988	1.958
1989	2.925
1990	4.58
1991	7.305
1992	3.095
1993	2.276
1994	2.963
1995	4.016
1996	3.747
1997	5.994
1998	-16.909
1999	13.228
2000	-0.189
2001	2.017
2002	-1.279
2003	0.402
2004	2.761
2005	4.266
2006	2.309
2007	3.263
2008	3.204
2009	3.369
2010	4.611
2011	8.085
2012	-1.713
2013	3.256
2014	0.965
2015	6.134
2016	6.263
2017	5.919
2018	3.8
2019	5
2020	5
2021	5
2022	5
2023	5
2024	5