Year	Percent change
1980	20.5
1981	10.4
1982	14.9
1983	15.982
1984	17.06
1985	12.108
1986	23.9
1987	25.185
1988	15.185
1989	20.129
1990	21.219
1991	14.737
1992	21.142
1993	11.042
1994	9.046
1995	9.361
1996	7.095
1997	6.167
1998	5.041
1999	3.745
2000	2.849
2001	2.425
2002	2.431
2003	3.21
2004	8.106
2005	8.826
2006	4.202
2007	10.959
2008	11.698
2009	16.24
2010	11.69
2011	11.09
2012	8.65
2013	6.914
2014	10.097
2015	10.994
2016	10.199
2017	23.537
2018	20.86
2019	14.526
2020	12.273
2021	8.059
2022	7.156
2023	6.921
2024	6.917