Year	Number
1996	17.3913040161133
1998	17.3913040161133
2000	25.543478012085
2002	18.9189186096191
2003	22.7027034759521
2004	20.8955230712891
2005	21.0784320831299
2006	21.5686283111572
2007	20.8737869262695
2008	21.3592224121094
2009	23.4449768066406
2010	24.8803825378418
2011	26.0663509368896
2012	25.1184825897217
2013	24.1706161499023
2014	26.4423084259033
2015	25.7142848968506
2016	22.380952835083
2017	23.8095245361328
2018	23.3333339691162
2019	25.238094329834
2020	25.7142848968506
2021	22.8571434020996
2022	20.2830181121826