Year	Percent change (Units)
1980	0.000
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	5.824
1990	2.121
1991	14.505
1992	4.343
1993	1.058
1994	-3.378
1995	9.164
1996	9.676
1997	3.696
1998	-5.930
1999	-3.471
2000	-2.420
2001	12.890
2002	11.888
2003	-3.503
2004	-0.339
2005	3.807
2006	-0.407
2007	1.300
2008	6.181
2009	2.684
2010	6.606
2011	4.523
2012	6.497
2013	-5.821
2014	1.666
2015	5.463
2016	-3.821
2017	3.706
2018	-5.227
2019	1.246
2020	-2.186
2021	-1.057
2022	-1.407
2023	4.657
2024	4.631
2025	2.868
2026	0.695
2027	3.612
2028	2.175
2029	2.569