Year	Percent change
1980	12.867
1981	23.369
1982	26.89
1983	68.526
1984	66.575
1985	76.576
1986	80.867
1987	178.7
1988	34.287
1989	60.8
1990	110.946
1991	102.695
1992	65.5
1993	22.202
1994	24.199
1995	25.987
1996	23.137
1997	14.559
1998	35.986
1999	34.092
2000	-0.918
2001	2.568
2002	0.121
2003	3.991
2004	12.922
2005	13.702
2006	10.533
2007	16.97
2008	8.205
2009	7.469
2010	7.194
2011	6.788
2012	6.588
2013	5.518
2014	4.645
2015	6.694
2016	10.883
2017	18.22
2018	16.865
2019	15.761
2020	13
2021	11.1
2022	9.6
2023	8.75
2024	8.25