Year	Percent change
1980	28.699
1981	4.787
1982	7.003
1983	16.657
1984	31.158
1985	23.114
1986	10.722
1987	8.364
1988	8.554
1989	17.177
1990	29.809
1991	85.097
1992	40.194
1993	30.124
1994	26.795
1995	25.567
1996	15.842
1997	9.167
1998	7.851
1999	6.782
2000	3.228
2001	11.753
2002	6.899
2003	14.127
2004	15.815
2005	10.516
2006	5.493
2007	16.819
2008	16.844
2009	10.215
2010	11.74
2011	6.012
2012	8.002
2013	9.473
2014	6.357
2015	3.661
2016	1.725
2017	5.246
2018	2.413
2019	4.86
2020	5
2021	5
2022	5
2023	5
2024	5