Year	Percent change
1980	12.762
1981	19.481
1982	6.211
1983	10.673
1984	10.436
1985	12.799
1986	10.604
1987	10.163
1988	7.485
1989	8.583
1990	11.782
1991	1.935
1992	1.505
1993	5.444
1994	8.777
1995	7.727
1996	0.733
1997	5.957
1998	12.675
1999	3.073
2000	1.554
2001	2.479
2002	3.833
2003	6.498
2004	5.505
2005	7.064
2006	9.012
2007	14.014
2008	6.688
2009	7.65
2010	11.55
2011	7.614
2012	7.136
2013	7.346
2014	6.108
2015	5.892
2016	5.738
2017	5.743
2018	5.444
2019	5.378
2020	5.455
2021	5.5
2022	5.5
2023	5.5
2024	5.5