Year	Percent change
1980	33.9
1981	18.868
1982	-35.687
1983	-36.991
1984	18.457
1985	12.37
1986	-7.596
1987	3.625
1988	36.702
1989	18.438
1990	19.498
1991	15.283
1992	19.864
1993	16.033
1994	18.096
1995	-15.942
1996	17.478
1997	23.113
1998	14.804
1999	11.513
2000	20.297
2001	-0.841
2002	1.208
2003	2.511
2004	6.483
2005	5.379
2006	8.686
2007	4.826
2008	3.281
2009	-15.949
2010	17.055
2011	5.618
2012	5.417
2013	2.118
2014	5.919
2015	5.919
2016	2.919
2017	6.191
2018	6.197
2019	2.965
2020	3.503
2021	4.147
2022	4.41
2023	4.455
2024	4.503