Year	Number
1996	27.7173919677734
1998	36.9565200805664
2000	36.4130439758301
2002	32.4324340820313
2003	31.3513507843018
2004	30.8457717895508
2005	30.8823528289795
2006	36.764705657959
2007	38.3495140075684
2008	37.8640785217285
2009	37.3205757141113
2010	33.9712905883789
2011	36.4928894042969
2012	36.4928894042969
2013	33.6492881774902
2014	29.3269233703613
2015	28.5714282989502
2016	28.0952377319336
2017	28.5714282989502
2018	29.5238094329834
2019	28.5714282989502
2020	28.0952377319336
2021	29.5238094329834
2022	28.301887512207