Year	%
1988	8.452956
1989	7.669897
1990	7.572112
1991	6.885635
1992	6.313154
1993	6.181393
1994	4.845572
1995	5.230263
1996	3.95873
1997	5.103618
1998	5.151575
1999	5.002307
2000	4.611807
2001	4.671997
2002	4.481588
2003	4.519302
2004	4.673805
2005	4.681125
2006	2.46663
2007	2.4072
2008	2.388898
2009	2.869977
2010	2.636345
2011	2.086662
2012	3.293339
2013	11.72671
2014	0
2015	2.380024
2016	1.519722
2017	0.7753317
2018	0.5988626
2019	0.7263275
2020	0.7692496
2021	0.6643468