Year	Number
1996	14.070351600647
1998	16
2000	13.9303483963013
2002	11.4427862167358
2003	15.4228858947754
2004	14.4230766296387
2005	20.0956935882568
2006	12.4401912689209
2007	14.8325357437134
2008	19.7115383148193
2009	28.4360198974609
2010	29.3838863372803
2011	30.9859161376953
2012	26.7605628967285
2013	29.577465057373
2014	32.211540222168
2015	36.1904754638672
2016	32.3809509277344
2017	32.8571434020996
2018	33.3333320617676
2019	32.8571434020996
2020	36.1904754638672
2021	33.3333320617676
2022	35.8490562438965