Year	Percent change
1981	0.002
1982	2.8
1983	2.8
1984	2.8
1985	2.8
1986	2.7
1987	2.7
1988	2.5
1989	6.404
1990	23.9
1991	333.5
1992	82
1993	72.804
1994	96
1995	62.1
1996	123
1997	1061.21
1998	18.679
1999	2.572
2000	10.318
2001	7.358
2002	5.813
2003	2.348
2004	6.149
2005	6.038
2006	7.416
2007	7.572
2008	11.951
2009	2.469
2010	3.039
2011	3.386
2012	2.391
2013	0.385
2014	-1.601
2015	-1.067
2016	-1.323
2017	1.188
2018	2.631
2019	2.416
2020	2.262
2021	2.3
2022	2.3
2023	2.3
2024	2.3