Year	Percent change (Units)
1993	3.006
1994	-37.277
1995	34.887
1996	30.741
1997	43.435
1998	-11.841
1999	7.407
2000	28.073
2001	2.315
2002	13.854
2003	13.444
2004	21.568
2005	0.590
2006	22.039
2007	7.612
2008	14.470
2009	-13.132
2010	9.366
2011	15.054
2012	9.434
2013	-6.096
2014	2.086
2015	-12.048
2016	-2.511
2017	12.011
2018	5.284
2019	5.279
2020	-8.953
2021	6.642
2022	-12.182
2023	3.932
2024	3.035
2025	2.324
2026	1.874
2027	0.925
2028	0.794
2029	0.927