Year	Number
1996	21.8085098266602
1998	41.4893608093262
2000	38.624340057373
2002	28.0423278808594
2003	29.1457290649414
2004	27.6699028015137
2005	19.9029121398926
2006	20.2898559570313
2007	22.7053146362305
2008	25.480770111084
2009	20.3791465759277
2010	21.8009471893311
2011	22.274881362915
2012	26.0663509368896
2013	27.962085723877
2014	31.9047622680664
2015	31.4285717010498
2016	26.1904754638672
2017	21.9047622680664
2018	23.5849056243896
2019	21.698112487793
2020	23.1132068634033
2021	25
2022	23.5849056243896