Year	Percent change (Units)
1989	7.813
1990	6.884
1991	1.525
1992	0.334
1993	1.830
1994	2.778
1995	4.928
1996	1.667
1997	-0.298
1998	1.495
1999	1.767
2000	5.789
2001	3.146
2002	3.050
2003	2.445
2004	2.638
2005	2.693
2006	3.337
2007	2.999
2008	3.695
2009	2.052
2010	2.646
2011	2.990
2012	2.102
2013	2.647
2014	1.719
2015	1.690
2016	1.385
2017	2.095
2018	1.695
2019	1.842
2020	0.947
2021	3.584
2022	7.825
2023	4.049
2024	3.443
2025	2.830
2026	2.523
2027	2.830
2028	2.422
2029	2.625