Year	Number
1996	5.52763795852661
1998	7
2000	9.45273590087891
2002	5.97014904022217
2003	7.96019887924194
2004	13.4615383148193
2005	8.13397121429443
2006	10.0478467941284
2007	12.4401912689209
2008	17.7884616851807
2009	17.5355453491211
2010	16.1137447357178
2011	14.0845069885254
2012	14.5539903640747
2013	15.023473739624
2014	9.61538505554199
2015	8.09523773193359
2016	8.09523773193359
2017	9.5238094329834
2018	9.0476188659668
2019	9.0476188659668
2020	8.09523773193359
2021	8.09523773193359
2022	8.01886749267578