Year	Percent change
1991	8.41
1992	8.076
1993	11.7
1994	-44.317
1995	36.429
1996	48.517
1997	18.171
1998	15.4
1999	-17.277
2000	-7.414
2001	12.63
2002	13.859
2003	-1.857
2004	-10.271
2005	1.835
2006	12.736
2007	8.053
2008	8.631
2009	-1.8
2010	-6.212
2011	-14.795
2012	21.332
2013	-2.567
2014	4.416
2015	-7.666
2016	-14.541
2017	0.533
2018	-12.64
2019	-6.552
2020	15.428
2021	10.467
2022	9.205
2023	8.032
2024	3.012