Year	Percent change (Units)
1991	-0.552
1992	2.193
1993	1.569
1994	0.257
1995	1.872
1996	4.052
1997	2.886
1998	2.496
1999	0.522
2000	5.518
2001	6.667
2002	14.604
2003	9.503
2004	10.442
2005	7.008
2006	6.726
2007	7.318
2008	7.199
2009	8.353
2010	11.259
2011	4.887
2012	4.279
2013	5.394
2014	6.310
2015	2.653
2016	-1.617
2017	0.806
2018	1.923
2019	2.208
2020	-1.794
2021	3.647
2022	3.252
2023	2.860
2024	3.338
2025	2.964
2026	2.983
2027	3.340
2028	3.336
2029	3.315