Year	Number
1996	16.5
1998	13.9303483963013
2000	12.93532371521
2002	8.95522403717041
2003	15.4228858947754
2004	15.384614944458
2005	9.61538505554199
2006	8.65384578704834
2007	10.0961542129517
2008	9.13461494445801
2009	8.05687236785889
2010	7.10900497436523
2011	7.0422534942627
2012	6.1032862663269
2013	5.63380289077759
2014	6.40394067764282
2015	3.94088673591614
2016	1.97044336795807
2017	1.97044336795807
2018	0.970873773097992
2019	0.966183602809906
2020	0.966183602809906
2021	1.44927537441254
2022	1.44927537441254