Year	Percent change
1980	11.927
1981	11.949
1982	5.862
1983	6.446
1984	6.056
1985	5.564
1986	3.467
1987	4.692
1988	8.835
1989	7.882
1990	9.051
1991	12.628
1992	4.849
1993	9.827
1994	11.268
1995	13.024
1996	10.784
1997	11.808
1998	7.807
1999	5.737
2000	3.588
2001	4.408
2002	3.536
2003	3.103
2004	4.566
2005	9.278
2006	7.922
2007	7.77
2008	12.001
2009	19.561
2010	10.104
2011	13.661
2012	11.005
2013	7.361
2014	8.621
2015	4.526
2016	2.863
2017	4.148
2018	3.925
2019	7.644
2020	6.984
2021	5
2022	5
2023	5
2024	5