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	15.465
1992	-7.076
1993	12.603
1994	-3.938
1995	-2.893
1996	-12.365
1997	-2.906
1998	-11.214
1999	33.676
2000	12.984
2001	-21.580
2002	6.545
2003	6.185
2004	9.182
2005	3.235
2006	8.730
2007	12.127
2008	4.050
2009	-12.106
2010	5.578
2011	6.188
2012	0.511
2013	2.835
2014	4.788
2015	5.246
2016	4.522
2017	5.510
2018	4.398
2019	4.081
2020	-4.933
2021	11.408
2022	4.392
2023	-0.874
2024	1.906
2025	3.704
2026	3.727
2027	3.760
2028	3.855
2029	3.821