Year	Number
1996	23.3695659637451
1998	22.2826080322266
2000	21.7391300201416
2002	35.1351356506348
2003	18.9189186096191
2004	19.9004974365234
2005	23.529411315918
2006	26.470588684082
2007	27.6699028015137
2008	28.1553401947021
2009	31.5789470672607
2010	33.0143547058105
2011	33.1753540039063
2012	34.1232223510742
2013	29.8578205108643
2014	31.730770111084
2015	28.0952377319336
2016	39.523811340332
2017	34.761905670166
2018	41.4285697937012
2019	41.4285697937012
2020	36.6666679382324
2021	32.3809509277344
2022	29.7169818878174