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	3.654
1990	-10.104
1991	2.175
1992	54.823
1993	18.595
1994	5.656
1995	8.358
1996	21.979
1997	9.173
1998	10.635
1999	-13.747
2000	26.141
2001	18.570
2002	12.092
2003	-15.828
2004	-2.105
2005	10.500
2006	19.237
2007	11.060
2008	3.809
2009	-5.215
2010	3.680
2011	9.344
2012	-2.183
2013	-8.470
2014	-3.007
2015	14.768
2016	8.008
2017	9.100
2018	0.573
2019	-0.243
2020	-20.245
2021	15.157
2022	-5.901
2023	6.193
2024	11.160
2025	3.645
2026	3.874
2027	6.418
2028	4.564
2029	3.968