Year	Percent change
1980	1.278
1981	2.702
1982	6.112
1983	-2.058
1984	9.651
1985	6.437
1986	8.842
1987	8.268
1988	10.353
1989	6.013
1990	5.454
1991	2.27
1992	3.077
1993	5.418
1994	5.404
1995	3.462
1996	5.897
1997	7.327
1998	1.024
1999	3.943
2000	10.134
2001	5.517
2002	2.47
2003	-3.444
2004	4.058
2005	9.695
2006	2.918
2007	-0.051
2008	6.488
2009	-3.368
2010	-1.466
2011	1.784
2012	-0.656
2013	5.466
2014	6.056
2015	2.147
2016	2.318
2017	1.171
2018	2.986
2019	3.5
2020	3.5
2021	3
2022	2.7
2023	2.703
2024	2.713