Year	Percent change
1980	10.667
1981	11.4
1982	4.898
1983	6.719
1984	3.208
1985	19.176
1986	32.78
1987	10.848
1988	10.295
1989	12.988
1990	37.977
1991	35.113
1992	10.241
1993	13.363
1994	12.507
1995	8.41
1996	11.057
1997	9.235
1998	6.617
1999	5.209
2000	5.979
2001	7.284
2002	8.136
2003	5.602
2004	7.579
2005	9.107
2006	6.562
2007	6.822
2008	11.355
2009	1.86
2010	3.86
2011	6.215
2012	3.783
2013	4.343
2014	3.418
2015	2.389
2016	4.448
2017	4.425
2018	3.752
2019	3.402
2020	3.703
2021	3.87
2022	4.043
2023	4.151
2024	4.24