Year	Percent change
1980	41.493
1981	-8.239
1982	-42.58
1983	-6.924
1984	4.705
1985	-13.038
1986	18.523
1987	11.422
1988	-9.204
1989	-16.419
1990	-0.69
1991	75.576
1992	66.462
1993	13.423
1994	26.7
1995	-11.484
1996	19.483
1997	30.046
1998	9.881
1999	-15.955
2000	-2.407
2001	-16.629
2002	-53.553
2003	48.933
2004	51.165
2005	18.375
2006	12.966
2007	22.202
2008	14.597
2009	-23.858
2010	39.414
2011	21.578
2012	-5.952
2013	3.548
2014	-10.842
2015	2.644
2016	3.568
2017	14.224
2018	-6.14
2019	-8.877
2020	9.393
2021	7.675
2022	9.455
2023	9.505
2024	7.789