Year	Percent change
1981	-0.992
1982	-36.205
1983	-27.134
1984	59.084
1985	-13.886
1986	-3.858
1987	53.256
1988	32.73
1989	-32.525
1990	73.048
1991	-0.628
1992	-25.01
1993	37.199
1994	-49.648
1995	30.183
1996	3.743
1997	-11.047
1998	118.564
1999	-31.21
2000	-29.743
2001	12.023
2002	45.82
2003	35.042
2004	114.455
2005	15.696
2006	37.649
2007	6.778
2008	1.484
2009	87.791
2010	137.952
2011	51.222
2012	3.259
2013	50.235
2014	16.219
2015	-14.867
2016	38.896
2017	13.593
2018	19.717
2019	14.679
2020	6.758
2021	7.676
2022	0.571
2023	1.095
2024	0.57