Year	Percent change
1980	67.807
1981	-20.509
1982	-24.66
1983	-28.526
1984	14.23
1985	-19.005
1986	17.526
1987	13.253
1988	-15.31
1989	1.044
1990	-24.706
1991	104.504
1992	76.694
1993	13.423
1994	26.7
1995	-11.484
1996	19.483
1997	29.918
1998	9.512
1999	-15.919
2000	-2.423
2001	-17.167
2002	-53.202
2003	49.778
2004	50.389
2005	18.463
2006	12.825
2007	22.306
2008	14.166
2009	-23.579
2010	39.714
2011	21.38
2012	-6.194
2013	3.682
2014	-11.226
2015	3.176
2016	3.37
2017	14.554
2018	-6.877
2019	-8.252
2020	9.319
2021	7.816
2022	9.36
2023	9.54
2024	7.773