Year	Percent change
1980	20.3
1981	9.6
1982	15.6
1983	16.735
1984	19.58
1985	11.404
1986	27.953
1987	25.11
1988	9.991
1989	16.653
1990	21.38
1991	20.709
1992	9.744
1993	14.953
1994	6.393
1995	9.725
1996	8.156
1997	4.761
1998	3.378
1999	2.877
2000	2.542
2001	2.231
2002	2.749
2003	4.013
2004	11.709
2005	4.732
2006	7.259
2007	8.571
2008	19.914
2009	9.931
2010	10.58
2011	11.783
2012	7.257
2013	9.754
2014	8.2
2015	11.388
2016	13.969
2017	29.764
2018	14.384
2019	12.753
2020	10.748
2021	7.711
2022	7.24
2023	6.93
2024	7.033