Year	Percent change
1980	35.135
1981	23.8
1982	28.5
1983	33.6
1984	141.3
1985	571.4
1986	885.2
1987	13109.50
1988	4775.20
1989	7428.70
1990	3004.10
1991	116.6
1992	21.9
1993	13.5
1994	3.7
1995	11.118
1996	11.651
1997	9.189
1998	13.046
1999	11.212
2000	11.547
2001	7.357
2002	3.75
2003	5.302
2004	8.47
2005	9.599
2006	9.14
2007	11.127
2008	19.826
2009	3.687
2010	5.455
2011	8.082
2012	7.194
2013	7.136
2014	6.036
2015	3.997
2016	3.524
2017	3.851
2018	4.965
2019	5.142
2020	3.934
2021	3.951
2022	4.034
2023	4.124
2024	5.029