Year	Number
1996	13
1998	13.4328355789185
2000	11.4427862167358
2002	13.4328355789185
2003	21.3930339813232
2004	21.1538467407227
2005	24.0384616851807
2006	29.3269233703613
2007	28.8461532592773
2008	28.365385055542
2009	28.9099521636963
2010	28.9099521636963
2011	27.6995296478271
2012	27.2300472259521
2013	26.7605628967285
2014	25.6157627105713
2015	25.6157627105713
2016	23.645320892334
2017	24.630542755127
2018	23.3009700775146
2019	23.6714973449707
2020	23.1884059906006
2021	20.2898559570313
2022	21.7391300201416