Year	Number
1996	18.5929641723633
1998	21
2000	24.8756217956543
2002	20.3980102539063
2003	22.8855724334717
2004	25
2005	19.6172256469727
2006	21.0526313781738
2007	25.3588523864746
2008	31.25
2009	29.8578205108643
2010	27.014217376709
2011	23.9436626434326
2012	25.8215961456299
2013	24.8826293945313
2014	18.75
2015	16.1904754638672
2016	16.6666660308838
2017	17.619047164917
2018	17.1428565979004
2019	18.0952377319336
2020	15.2380952835083
2021	16.1904754638672
2022	14.6226415634155