Year	Percent change
1980	18.14
1981	13.856
1982	-2.753
1983	14.805
1984	22.1
1985	5.568
1986	15.257
1987	33.509
1988	26.771
1989	10.431
1990	9.514
1991	17.316
1992	19.82
1993	13.614
1994	9.985
1995	11.407
1996	4.569
1997	6.023
1998	-4.568
1999	3.632
2000	18.535
2001	-1.795
2002	8.365
2003	14.862
2004	15.644
2005	12.416
2006	10.236
2007	6.875
2008	3.241
2009	-11.255
2010	18.031
2011	4.631
2012	3.305
2013	8.211
2014	0.84
2015	-1.726
2016	1.558
2017	6.451
2018	3.547
2019	2.101
2020	2.99
2021	3.403
2022	3.52
2023	3.603
2024	3.544