Year	Percent change
1980	9.9
1981	17.051
1982	7.563
1983	6.844
1984	7.468
1985	8.107
1986	6.791
1987	-2.153
1988	-7.865
1989	-1.77
1990	-6.161
1991	-3.764
1992	-3.05
1993	-3.158
1994	-2.495
1995	3.304
1996	4.912
1997	5.314
1998	4.895
1999	4.062
2000	3.553
2001	4.368
2002	4.237
2003	4.567
2004	6.781
2005	2.021
2006	3.458
2007	4.902
2008	3.489
2009	2.199
2010	3.423
2011	4.129
2012	4.543
2013	5.404
2014	5.884
2015	5.651
2016	4.648
2017	3.549
2018	4.047
2019	4.299
2020	4.736
2021	4.892
2022	5.102
2023	5.313
2024	5.521