Year	Number
1996	28.8043479919434
1998	25.543478012085
2000	21.7391300201416
2002	21.0810813903809
2003	21.0810813903809
2004	15.4228858947754
2005	26.470588684082
2006	34.8039207458496
2007	31.0679607391357
2008	29.6116504669189
2009	30.1435413360596
2010	29.6650714874268
2011	28.4360198974609
2012	26.0663509368896
2013	26.0663509368896
2014	27.884614944458
2015	28.0952377319336
2016	27.1428565979004
2017	29.0476188659668
2018	27.619047164917
2019	27.1428565979004
2020	24.2857151031494
2021	23.8095245361328
2022	20.2830181121826