Year	Percent change (Units)
1990	15.369
1991	-16.715
1992	-4.532
1993	1.317
1994	46.950
1995	3.451
1996	0.822
1997	2.115
1998	0.548
1999	-0.949
2000	1.795
2001	0.935
2002	0.421
2003	3.521
2004	-0.486
2005	1.115
2006	-0.673
2007	-0.195
2008	5.576
2009	0.866
2010	0.687
2011	2.302
2012	2.167
2013	3.263
2014	1.738
2015	-1.151
2016	4.071
2017	1.057
2018	6.253
2019	1.021
2020	1.553
2021	1.675
2022	5.383
2023	2.254
2024	2.202
2025	2.194
2026	2.270
2027	2.340
2028	2.378
2029	2.466