Year	Number
1996	22.340425491333
1998	37.7659568786621
2000	28.5714282989502
2002	23.8095245361328
2003	20.6030158996582
2004	20.3883495330811
2005	23.7864074707031
2006	20.7729473114014
2007	20.2898559570313
2008	20.6730766296387
2009	23.222749710083
2010	26.0663509368896
2011	25.5924167633057
2012	27.488151550293
2013	39.3364944458008
2014	45.238094329834
2015	40.9523811340332
2016	44.2857131958008
2017	41.9047622680664
2018	42.4528312683105
2019	39.1509437561035
2020	37.2641525268555
2021	37.2641525268555
2022	38.6792449951172