Year	Percent change
1980	18.724
1981	13.269
1982	-33.994
1983	-17.671
1984	12.002
1985	-9.462
1986	7.904
1987	18.61
1988	12.793
1989	25.038
1990	5.8
1991	7.129
1992	21.812
1993	13.97
1994	10.15
1995	25.158
1996	11.867
1997	13.215
1998	6.87
1999	-9.791
2000	10.352
2001	5.316
2002	1.847
2003	5.697
2004	19.295
2005	18.371
2006	11.765
2007	13.769
2008	11.576
2009	-16.682
2010	25.602
2011	15.418
2012	5.108
2013	2.137
2014	-6.477
2015	-1.193
2016	0.891
2017	4.723
2018	7.617
2019	1.614
2020	2.414
2021	3.848
2022	3.488
2023	3.377
2024	3.255