Year	Percent change
1988	31
1989	89
1990	151
1991	150
1992	112
1993	41
1994	29.902
1995	-1.859
1996	10.034
1997	16.69
1998	7.982
1999	0.181
2000	0.341
2001	-0.527
2002	1.427
2003	-0.042
2004	5.265
2005	8.411
2006	4.201
2007	13.952
2008	12.52
2009	5.325
2010	3.143
2011	4.908
2012	2.54
2013	4.676
2014	1.04
2015	2.842
2016	3.881
2017	2.231
2018	1.632
2019	2.558
2020	2.83
2021	3.037
2022	3
2023	3
2024	3