Year	Percent change
1980	59.145
1981	75.433
1982	64.46
1983	111.149
1984	110.209
1985	163.398
1986	77.921
1987	85.846
1988	666.955
1989	3398.27
1990	7481.69
1991	409.528
1992	73.529
1993	48.58
1994	23.735
1995	11.13
1996	11.549
1997	8.547
1998	7.255
1999	3.469
2000	3.759
2001	1.975
2002	0.192
2003	2.261
2004	3.662
2005	1.618
2006	2.001
2007	1.779
2008	5.788
2009	2.935
2010	1.53
2011	3.37
2012	3.655
2013	2.806
2014	3.246
2015	3.548
2016	3.593
2017	2.804
2018	1.317
2019	2.389
2020	1.998
2021	1.953
2022	1.995
2023	1.995
2024	1.995