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	0.000
1990	0.000
1991	6.066
1992	-7.680
1993	4.389
1994	-3.010
1995	10.351
1996	-6.388
1997	-1.554
1998	-24.945
1999	40.284
2000	10.683
2001	-20.894
2002	7.101
2003	4.871
2004	8.904
2005	3.347
2006	8.186
2007	12.815
2008	3.403
2009	-10.646
2010	4.818
2011	5.842
2012	0.416
2013	3.329
2014	4.893
2015	7.785
2016	2.213
2017	5.837
2018	4.441
2019	3.872
2020	-6.830
2021	10.282
2022	6.294
2023	-0.208
2024	1.952
2025	3.701
2026	3.725
2027	3.640
2028	3.935
2029	3.919