Year	Percent change
1980	3.854
1981	6.631
1982	-2.912
1983	-1.145
1984	-1.718
1985	1.237
1986	1.698
1987	1.491
1988	9.271
1989	-3.658
1990	-0.579
1991	-0.666
1992	2.052
1993	-0.077
1994	-13.309
1995	2.898
1996	6.219
1997	3.814
1998	-0.386
1999	4.65
2000	3.897
2001	5.317
2002	4.506
2003	6.945
2004	7.032
2005	7.236
2006	7.904
2007	8.352
2008	7.774
2009	9.22
2010	10.298
2011	5.565
2012	7.598
2013	5.057
2014	4.698
2015	2.92
2016	3.757
2017	3.396
2018	3.477
2019	3.088
2020	2.862
2021	2.851
2022	2.704
2023	2.586
2024	2.485