Year	Percent change
1981	-0.514
1982	-1.283
1983	1.758
1984	3.118
1985	2.657
1986	3.126
1987	1.85
1988	4.585
1989	4.48
1990	4.178
1991	2.451
1992	1.589
1993	1.264
1994	3.008
1995	2.762
1996	3.494
1997	4.328
1998	4.668
1999	5.032
2000	4.199
2001	2.328
2002	0.217
2003	0.158
2004	1.983
2005	2.047
2006	3.462
2007	3.772
2008	2.172
2009	-3.667
2010	1.341
2011	1.55
2012	-1.031
2013	-0.127
2014	1.424
2015	1.958
2016	2.192
2017	2.869
2018	2.536
2019	1.809
2020	1.689
2021	1.489
2022	1.546
2023	1.453
2024	1.487