Year	Number
1996	28.4946231842041
1998	30.4812831878662
2000	20.7446804046631
2002	31.7460308074951
2003	35.4497337341309
2004	32.019702911377
2005	40.4878044128418
2006	36.0975608825684
2007	31.5533981323242
2008	33.980583190918
2009	29.6650714874268
2010	33.3333320617676
2011	33.6492881774902
2012	35.5450248718262
2013	39.3364944458008
2014	35.5769233703613
2015	29.5238094329834
2016	26.6666660308838
2017	22.380952835083
2018	21.9047622680664
2019	19.5238094329834
2020	20
2021	18.5714282989502
2022	19.8113212585449