Year	Percent change (Units)
1980	0.002
1981	0.000
1982	0.000
1983	0.000
1984	0.000
1985	0.000
1986	0.000
1987	0.000
1988	0.000
1989	0.000
1990	0.000
1991	0.000
1992	0.000
1993	1.302
1994	-5.187
1995	-1.097
1996	1.564
1997	12.604
1998	3.332
1999	19.922
2000	4.447
2001	4.681
2002	11.676
2003	13.387
2004	6.606
2005	12.515
2006	16.254
2007	-7.287
2008	1.759
2009	5.994
2010	-1.114
2011	-0.053
2012	11.265
2013	15.165
2014	-4.044
2015	-6.334
2016	-7.912
2017	-7.023
2018	9.990
2019	4.210
2020	-21.867
2021	32.718
2022	14.025
2023	0.774
2024	3.356
2025	2.520
2026	2.544
2027	2.544
2028	2.544
2029	2.544