Year	Percent change
1980	0.068
1981	18.124
1982	38.792
1983	9.072
1984	21.275
1985	21.923
1986	5.324
1987	-18.227
1988	-0.166
1989	43.538
1990	21.67
1991	5.519
1992	-14.754
1993	-12.291
1994	44.055
1995	6.095
1996	-8.292
1997	17.401
1998	15.277
1999	3.438
2000	19.054
2001	13.14
2002	19.005
2003	9.261
2004	9.02
2005	-13.188
2006	30.467
2007	-22.175
2008	53.178
2009	-45.17
2010	8.678
2011	89.225
2012	-8.683
2013	7.594
2014	-7.961
2015	-12.58
2016	9.063
2017	22.603
2018	7.133
2019	4.197
2020	9.754
2021	9.249
2022	5.471
2023	3.074
2024	3.436