Year	Percent change (Units)
1993	-7.395
1994	-15.953
1995	-6.393
1996	9.800
1997	7.600
1998	6.937
1999	-0.162
2000	13.522
2001	9.776
2002	4.862
2003	6.630
2004	7.362
2005	4.605
2006	7.948
2007	4.955
2008	-2.156
2009	-13.785
2010	7.805
2011	2.271
2012	-1.505
2013	2.603
2014	7.277
2015	10.241
2016	7.049
2017	6.947
2018	3.597
2019	6.852
2020	-23.197
2021	32.731
2022	26.991
2023	-2.936
2024	1.537
2025	2.780
2026	2.762
2027	2.762
2028	2.763
2029	2.763