Year	Percent change
1981	48.737
1982	13.751
1983	2.797
1984	10.159
1985	-5.045
1986	33.503
1987	-8.433
1988	5.97
1989	3.356
1990	-16.661
1991	13.231
1992	-15.156
1993	-7.198
1994	-2.382
1995	22.81
1996	7.236
1997	3.226
1998	-6.526
1999	-6.367
2000	15.567
2001	4.982
2002	6.171
2003	4.24
2004	6.282
2005	23.478
2006	12.915
2007	27.709
2008	43.751
2009	-44.87
2010	114.571
2011	52.151
2012	20.868
2013	0.597
2014	-10.285
2015	-26.248
2016	-6.934
2017	22.821
2018	18.157
2019	-4.078
2020	-0.612
2021	6.092
2022	0.982
2023	7.316
2024	7.423