Year	Number
2004	15.4228858947754
2005	21.0784320831299
2006	13.235294342041
2007	11.1650485992432
2008	11.1650485992432
2009	20.0956935882568
2010	19.1387557983398
2011	19.9052124023438
2012	16.1137447357178
2013	15.1658763885498
2014	19.230770111084
2015	21.9047622680664
2016	18.5714282989502
2017	18.0952377319336
2018	18.5714282989502
2019	20.4761905670166
2020	16.6666660308838
2021	19.5238094329834
2022	20.2830181121826