Year	Percent change (Units)
1991	2.196
1992	-17.396
1993	15.449
1994	80.786
1995	7.822
1996	-2.406
1997	8.457
1998	-7.220
1999	27.137
2000	2.540
2001	0.417
2002	6.186
2003	-6.516
2004	-6.189
2005	-0.935
2006	-4.456
2007	-12.830
2008	-4.284
2009	-3.034
2010	-0.201
2011	-14.006
2012	-14.734
2013	0.205
2014	0.631
2015	-55.692
2016	-57.287
2017	83.816
2018	-19.391
2019	2.454
2020	13.976
2021	-1.738
2022	-29.116
2023	-64.984
2024	1.614
2025	9.883
2026	377.352
2027	156.144
2028	8.047
2029	7.156