Year	Percent change
1980	10.011
1981	8.903
1982	13.673
1983	8.972
1984	8.596
1985	7.551
1986	6.159
1987	8.224
1988	7.156
1989	7.722
1990	6.502
1991	7.693
1992	5.518
1993	4.04
1994	5.423
1995	6.232
1996	3.733
1997	3.599
1998	3.102
1999	2.768
2000	2.77
2001	1.945
2002	2.714
2003	2.72
2004	3.692
2005	1.962
2006	4.143
2007	3.421
2008	4.915
2009	3.541
2010	5.812
2011	3.548
2012	5.139
2013	5.805
2014	4.924
2015	4.797
2016	3.629
2017	5.309
2018	7.308
2019	7.466
2020	5.572
2021	4.438
2022	4.332
2023	4.161
2024	4.035