Year	Percent change
1991	44.913
1992	51.2
1993	61.746
1994	71.277
1995	63.892
1996	38.785
1997	4.635
1998	11.542
1999	7.909
2000	10.964
2001	11.916
2002	12.239
2003	10.831
2004	12.49
2005	9.867
2006	10.845
2007	7.905
2008	18.976
2009	3.675
2010	11.175
2011	19.544
2012	9.885
2013	10.968
2014	8.159
2015	11.996
2016	-12.563
2017	24.664
2018	41.773
2019	20
2020	7.5
2021	5
2022	5
2023	5
2024	5