Year	Percent change (Units)
1989	-22.895
1990	-4.529
1991	16.756
1992	5.756
1993	-3.591
1994	7.659
1995	14.371
1996	13.729
1997	22.740
1998	7.354
1999	19.325
2000	-4.808
2001	-0.423
2002	2.802
2003	2.203
2004	8.021
2005	8.503
2006	22.529
2007	12.528
2008	10.032
2009	-9.249
2010	11.889
2011	11.876
2012	6.900
2013	0.327
2014	4.869
2015	12.056
2016	4.151
2017	3.321
2018	-14.873
2019	-4.048
2020	0.873
2021	17.989
2022	6.440
2023	9.158
2024	7.609
2025	5.004
2026	6.130
2027	4.858
2028	4.855
2029	4.921