Year	Percent change
1991	1.57
1992	-3.038
1993	11.984
1994	-20.109
1995	68.142
1996	103.721
1997	16.44
1998	-2.915
1999	18.366
2000	-1.193
2001	1.533
2002	8.999
2003	-6.018
2004	-9.004
2005	-2.029
2006	-3.882
2007	-10.774
2008	-2.586
2009	0.671
2010	6.907
2011	-18.208
2012	-12.883
2013	4.33
2014	7.902
2015	-35.25
2016	-69.287
2017	-13.983
2018	0.242
2019	11.934
2020	300.433
2021	6.739
2022	6.944
2023	2.986
2024	21.069