Year	Percent change (Units)
1990	3.696
1991	4.582
1992	1.461
1993	1.392
1994	1.325
1995	2.569
1996	3.142
1997	11.347
1998	0.872
1999	2.123
2000	3.118
2001	2.600
2002	1.849
2003	2.893
2004	1.697
2005	6.041
2006	7.922
2007	2.852
2008	6.479
2009	1.183
2010	4.291
2011	2.037
2012	0.506
2013	0.613
2014	-0.546
2015	-2.396
2016	0.028
2017	0.756
2018	-0.749
2019	-0.837
2020	-1.179
2021	1.931
2022	3.855
2023	2.070
2024	2.301
2025	2.044
2026	2.044
2027	2.044
2028	2.044
2029	2.044