Year	Number
1996	19
1998	15.4228858947754
2000	13.9303483963013
2002	11.4427862167358
2003	16.4179096221924
2004	20.6730766296387
2005	16.8269233703613
2006	18.75
2007	24.0384616851807
2008	31.730770111084
2009	32.7014236450195
2010	34.5971565246582
2011	34.2723007202148
2012	39.9061050415039
2013	43.1924896240234
2014	44.8275871276855
2015	46.305419921875
2016	46.305419921875
2017	46.7980308532715
2018	49.029125213623
2019	49.7584533691406
2020	53.6231880187988
2021	55.0724639892578
2022	53.1400947570801