Year	Percent change
1981	12.766
1982	13.208
1983	11.667
1984	11.94
1985	18.667
1986	17.978
1987	15.238
1988	12.397
1989	15.441
1990	14.65
1991	16.111
1992	9.569
1993	9.607
1994	9.562
1995	6.909
1996	9.524
1997	6.211
1998	9.064
1999	2.145
2000	6.824
2001	4.668
2002	12.441
2003	0.209
2004	3.542
2005	3.622
2006	5.825
2007	8.807
2008	10.066
2009	6.308
2010	3.473
2011	6.154
2012	5.665
2013	5.362
2014	5.325
2015	5.281
2016	6.724
2017	4.717
2018	4.92
2019	5.3
2020	5.5
2021	5.5
2022	5.5
2023	5.5
2024	5.5