Year	Percent change (Units)
1989	2.460
1990	4.384
1991	3.121
1992	2.032
1993	2.290
1994	1.842
1995	3.937
1996	6.354
1997	-0.536
1998	-0.852
1999	-1.042
2000	0.995
2001	0.898
2002	3.237
2003	2.348
2004	3.042
2005	4.166
2006	2.957
2007	4.080
2008	4.397
2009	-0.399
2010	0.017
2011	2.271
2012	0.807
2013	1.607
2014	-0.173
2015	-0.585
2016	1.148
2017	1.033
2018	-0.108
2019	0.164
2020	0.381
2021	4.906
2022	6.737
2023	3.723
2024	2.609
2025	1.258
2026	1.258
2027	1.258
2028	1.258
2029	1.258