Year	Percent change
1980	2.894
1981	4.127
1982	0.063
1983	-0.474
1984	6.346
1985	5.456
1986	2.448
1987	4.893
1988	4.253
1989	4.626
1990	1.502
1991	-1.009
1992	2.565
1993	3.902
1994	4.892
1995	2.843
1996	4.159
1997	4.558
1998	4.723
1999	4.446
2000	3.038
2001	2.601
2002	4.176
2003	2.671
2004	4.28
2005	2.878
2006	2.819
2007	4.368
2008	2.675
2009	1.884
2010	2.386
2011	2.765
2012	3.875
2013	2.137
2014	2.642
2015	2.461
2016	2.779
2017	2.382
2018	2.811
2019	2.072
2020	2.759
2021	2.762
2022	2.641
2023	2.65
2024	2.638