Year	Number
1996	20
1998	18.4079608917236
2000	11.9402980804443
2002	10.945273399353
2003	9.95024871826172
2004	7.21153831481934
2005	5.76923084259033
2006	8.17307662963867
2007	8.65384578704834
2008	9.61538505554199
2009	13.2701425552368
2010	13.2701425552368
2011	12.6760559082031
2012	20.1877937316895
2013	22.5352115631104
2014	27.0935955047607
2015	28.5714282989502
2016	32.019702911377
2017	32.019702911377
2018	32.5242729187012
2019	33.3333320617676
2020	28.9855079650879
2021	29.9516906738281
2022	31.4009666442871