Year	Percent change (Units)
1991	232.297
1992	-2.332
1993	12.206
1994	2.575
1995	-7.773
1996	-24.472
1997	10.182
1998	5.707
1999	0.657
2000	0.986
2001	7.933
2002	4.209
2003	0.990
2004	-4.518
2005	5.573
2006	-0.927
2007	3.514
2008	4.163
2009	11.232
2010	-11.582
2011	-10.064
2012	2.417
2013	-7.037
2014	5.644
2015	11.443
2016	10.270
2017	22.143
2018	8.880
2019	-6.545
2020	3.475
2021	23.444
2022	-3.287
2023	9.506
2024	13.759
2025	14.689
2026	7.762
2027	0.792
2028	6.262
2029	5.738