Year	Percent change
1980	188.57
1981	101.495
1982	131.503
1983	190.692
1984	444.878
1985	185.175
1986	19.653
1987	16.125
1988	16.397
1989	20.692
1990	17.612
1991	18.037
1992	9.37
1993	11.248
1994	14.452
1995	8.104
1996	10.587
1997	6.988
1998	8.622
1999	1.344
2000	0
2001	1.409
2002	6.496
2003	-1.902
2004	1.248
2005	2.343
2006	-0.12
2007	3.498
2008	3.73
2009	3.933
2010	2.703
2011	2.105
2012	1.649
2013	1.826
2014	-0.199
2015	-0.998
2016	-0.202
2017	0.404
2018	0.805
2019	1.284
2020	1.998
2021	1.998
2022	1.998
2023	1.998
2024	1.998