Year	Percent change
1987	12.347
1988	582.993
1989	55.5
1990	11.736
1991	130.107
1992	3.978
1993	-8.076
1994	123.8
1996	0
1997	117.21
1998	-12.348
1999	25.186
2000	28.88
2001	25.949
2002	9.871
2003	1.484
2004	26.485
2005	14.97
2006	15.656
2007	4.013
2008	2.394
2009	0.763
2010	25.54
2011	23.229
2012	26.605
2013	16.773
2014	13.196
2015	8.143
2016	13.443
2017	10.398
2018	16.593
2019	13.564
2020	10.884
2021	11.092
2022	10.911
2023	10.593
2024	10.215