Year	Number
1996	20.9677410125732
1998	14.9732618331909
2000	19.1489353179932
2002	15.3439149856567
2003	17.9894180297852
2004	21.1822662353516
2005	26.3414630889893
2006	20.9756088256836
2007	25.7281551361084
2008	27.1844654083252
2009	31.1004791259766
2010	30
2011	27.962085723877
2012	31.2796211242676
2013	33.1753540039063
2014	27.884614944458
2015	28.5714282989502
2016	30.4761905670166
2017	27.1428565979004
2018	31.9047622680664
2019	31.4285717010498
2020	28.0952377319336
2021	31.4285717010498
2022	31.1320762634277