Year	Percent change (Units)
1991	4.309
1992	8.698
1993	8.021
1994	24.110
1995	8.104
1996	-2.761
1997	32.646
1998	10.687
1999	-15.056
2000	12.871
2001	12.200
2002	1.802
2003	9.303
2004	13.290
2005	8.895
2006	6.750
2007	8.077
2008	7.571
2009	-4.465
2010	6.600
2011	8.675
2012	13.982
2013	6.072
2014	6.202
2015	2.647
2016	-1.022
2017	12.266
2018	10.103
2019	9.250
2020	-15.164
2021	32.380
2022	19.144
2023	-4.769
2024	6.774
2025	0.799
2026	0.646
2027	1.694
2028	2.906
2029	2.917