Year	Number
1996	14.5728645324707
1998	15.5
2000	20.3980102539063
2002	13.4328355789185
2003	21.3930339813232
2004	19.230770111084
2005	17.2248802185059
2006	13.8755979537964
2007	19.1387557983398
2008	23.5576915740967
2009	18.0094795227051
2010	16.1137447357178
2011	14.0845069885254
2012	16.9014091491699
2013	8.92018795013428
2014	4.807692527771
2015	3.80952382087708
2016	2.85714292526245
2017	4.2857141494751
2018	3.80952382087708
2019	3.80952382087708
2020	1.90476191043854
2021	2.38095235824585
2022	2.35849046707153