Year	Percent change
1980	18.278
1981	30.457
1982	31.907
1983	19.469
1984	9.72
1985	10.566
1986	14.492
1987	15.461
1988	26.338
1989	9.017
1990	11.859
1991	8.54
1992	14.567
1993	9.99
1994	38.992
1995	49.036
1996	19.761
1997	4.492
1998	6.21
1999	8.062
2000	10.67
2001	7.917
2002	16.499
2003	-1.704
2004	13.956
2005	18.364
2006	10.766
2007	10.288
2008	9.297
2009	8.954
2010	9.247
2011	9.483
2012	5.714
2013	5.826
2014	6.08
2015	7.404
2016	6.66
2017	8.281
2018	7.291
2019	6.654
2020	6.252
2021	5.758
2022	5.18
2023	5
2024	5