Year	Percent change (Units)
1992	-37.689
1993	40.659
1994	-5.731
1995	-3.112
1996	-4.067
1997	-18.604
1998	8.588
1999	9.414
2000	-5.354
2001	-1.314
2002	-20.921
2003	10.096
2004	-9.019
2005	10.971
2006	-7.921
2007	3.019
2008	1.769
2009	-14.838
2010	4.924
2011	-1.411
2012	-2.069
2013	1.554
2014	99.417
2015	35.628
2016	-3.528
2017	24.450
2018	-7.681
2019	9.271
2020	-1.489
2021	12.237
2022	-10.402
2023	8.760
2024	4.291
2025	3.981
2026	3.724
2027	3.298
2028	3.236
2029	3.370