Year	Number
1996	18.0851058959961
1998	21.2765960693359
2000	26.9841270446777
2002	20.1058197021484
2003	29.6482410430908
2004	26.2135925292969
2005	28.1553401947021
2006	38.164249420166
2007	39.613525390625
2008	35.0961532592773
2009	31.2796211242676
2010	27.014217376709
2011	18.4834117889404
2012	18.4834117889404
2013	14.2180099487305
2014	10.9523811340332
2015	17.1428565979004
2016	10.9523811340332
2017	9.5238094329834
2018	8.01886749267578
2019	6.13207530975342
2020	4.24528312683105
2021	4.71698093414307
2022	3.77358484268188