Year	Number
1996	16.5
1998	13.9303483963013
2000	19.4029846191406
2002	19.4029846191406
2003	20.8955230712891
2004	25.9615383148193
2005	24.0384616851807
2006	17.3076915740967
2007	10.5769233703613
2008	12.5
2009	13.2701425552368
2010	13.2701425552368
2011	12.6760559082031
2012	15.4929580688477
2013	15.023473739624
2014	9.35960578918457
2015	9.85221672058105
2016	11.3300495147705
2017	10.837438583374
2018	10.1941747665405
2019	7.24637699127197
2020	7.24637699127197
2021	12.0772943496704
2022	14.0096616744995