Year	Percent change (Units)
1989	5.609
1990	3.951
1991	6.077
1992	4.217
1993	6.109
1994	4.000
1995	4.100
1996	-1.667
1997	2.538
1998	4.726
1999	0.430
2000	1.033
2001	7.643
2002	0.830
2003	1.273
2004	-0.662
2005	-0.633
2006	3.080
2007	0.036
2008	24.237
2009	-1.307
2010	-1.923
2011	-0.828
2012	-3.830
2013	0.832
2014	3.116
2015	0.542
2016	0.839
2017	2.499
2018	-1.134
2019	-0.906
2020	2.769
2021	2.534
2022	16.207
2023	-2.109
2024	4.776
2025	2.500
2026	2.000
2027	1.900
2028	1.800
2029	1.800