Year	Percent change
1981	12.5
1982	19.136
1983	10.363
1984	11.268
1985	19.831
1986	12.676
1987	9.062
1988	15.759
1989	12.129
1990	17.66
1991	16.51
1992	15.298
1993	6.145
1994	10.658
1995	9.275
1996	8.814
1997	7.3
1998	8.947
1999	6.33
2000	6.999
2001	10.906
2002	7.719
2003	5.163
2004	3.693
2005	5.102
2006	5.93
2007	10.65
2008	10.541
2009	3.547
2010	3.612
2011	7.182
2012	4.969
2013	5.504
2014	2.012
2015	7.481
2016	4.448
2017	4.925
2018	5.2
2019	5.4
2020	5.6
2021	5.5
2022	5.5
2023	5.5
2024	5.5