Year	Percent change
1980	72.433
1981	-0.197
1982	21.666
1983	32.605
1984	6.558
1985	-5.861
1986	7.628
1987	-0.62
1988	6.366
1989	25.369
1990	-7.563
1991	28.671
1992	18.503
1993	15.655
1994	12.211
1995	12.875
1996	7.973
1997	20.759
1998	14.632
1999	8.717
2000	-12.561
2001	16.869
2002	-0.611
2003	13.228
2004	21.512
2005	4.201
2006	14.314
2007	50.368
2008	11.181
2009	-26.533
2010	4.183
2011	48.167
2012	-8.678
2013	11.112
2014	17.821
2015	11.571
2016	18.268
2017	0.354
2018	11.948
2019	-3.129
2020	2.599
2021	3.452
2022	3.87
2023	4.638
2024	7.268