Year	Percent change
1980	1.594
1981	1.994
1982	2.236
1983	-1.511
1984	-18.323
1985	-12.774
1986	3.488
1987	17.604
1988	12.893
1989	21.902
1990	6.039
1991	-3.43
1992	7.773
1993	12.597
1994	15.609
1995	11.558
1996	12.334
1997	7.316
1998	-11.194
1999	-14.927
2000	22.464
2001	-0.491
2002	3.403
2003	10.107
2004	6.577
2005	4.471
2006	5.597
2007	2.905
2008	9.762
2009	-9.87
2010	17.51
2011	-0.495
2012	10.184
2013	-3.284
2014	12.245
2015	4.758
2016	24.56
2017	24.004
2018	12.134
2019	14.626
2020	13.983
2021	7.128
2022	7.078
2023	7.326
2024	7.486