Year	Number
1996	31.1827964782715
1998	26.2032089233398
2000	18.6170215606689
2002	28.0423278808594
2003	23.280424118042
2004	21.674877166748
2005	18.536584854126
2006	19.5121955871582
2007	19.4174766540527
2008	19.4174766540527
2009	21.0526313781738
2010	20.9523811340332
2011	18.9573459625244
2012	15.1658763885498
2013	18.4834117889404
2014	14.9038457870483
2015	18.5714282989502
2016	31.9047622680664
2017	24.2857151031494
2018	37.1428565979004
2019	40.476188659668
2020	37.6190490722656
2021	34.761905670166
2022	31.1320762634277