Year	Percent change
1980	14.236
1981	15.28
1982	14.43
1983	12.463
1984	11.343
1985	16.393
1986	18.41
1987	16.228
1988	12.939
1989	14.757
1990	14.213
1991	15.21
1992	14.059
1993	9.658
1994	8.842
1995	8.753
1996	7.354
1997	8.63
1998	6.976
1999	5.082
2000	5.389
2001	5.637
2002	9.145
2003	5.871
2004	1.425
2005	3.351
2006	4.618
2007	7.154
2008	10.986
2009	7.121
2010	4.264
2011	4.985
2012	5.624
2013	5.76
2014	6.09
2015	4.575
2016	6.341
2017	5.273
2018	4.62
2019	4.956
2020	5.401
2021	5.5
2022	5.5
2023	5.5
2024	5.5