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
1990	0.000
1991	0.000
1997	-10.186
1998	31.411
1999	30.279
2000	-14.300
2001	33.181
2002	6.066
2003	7.733
2004	21.067
2005	9.912
2006	7.134
2007	21.240
2008	-0.650
2009	-2.590
2010	-11.014
2011	3.808
2012	-5.195
2013	-1.306
2014	6.113
2015	2.159
2016	9.381
2017	4.390
2018	4.234
2019	3.459
2020	-5.092
2021	18.143
2022	4.052
2023	-1.086
2024	8.537
2025	5.121
2026	4.984
2027	4.361
2028	5.030
2029	5.461