Year	Number
1996	19.5
1998	13.4328355789185
2000	12.93532371521
2002	13.4328355789185
2003	13.4328355789185
2004	18.269229888916
2005	13.4615383148193
2006	8.17307662963867
2007	7.21153831481934
2008	7.692307472229
2009	7.10900497436523
2010	6.63507127761841
2011	30.046947479248
2012	35.6807518005371
2013	39.9061050415039
2014	48.2758636474609
2015	48.7684745788574
2016	49.2610855102539
2017	44.3349761962891
2018	45.1456298828125
2019	49.2753639221191
2020	51.2077293395996
2021	46.3768119812012
2022	36.2318840026855