Year	Percent change (Units)
1980	9.892
1981	0.872
1982	-5.091
1983	7.786
1984	12.239
1985	-6.250
1986	27.777
1987	31.624
1988	25.779
1989	5.120
1990	4.989
1991	15.607
1992	11.060
1993	5.925
1994	7.321
1995	10.577
1996	5.964
1997	15.213
1998	6.530
1999	5.717
2000	17.555
2001	-16.660
2002	6.476
2003	8.464
2004	18.685
2005	3.252
2006	5.513
2007	3.287
2008	-0.833
2009	-15.208
2010	32.040
2011	1.575
2012	21.132
2013	1.587
2014	1.624
2015	-1.377
2016	-6.524
2017	3.692
2018	1.031
2019	2.567
2020	3.573
2021	19.651
2022	0.159
2023	-11.542
2024	4.775
2025	2.930
2026	2.601
2027	2.686
2028	3.028
2029	2.684