Year	Number
1996	37.5
1998	34.825870513916
2000	35.8208961486816
2002	35.8208961486816
2003	29.8507461547852
2004	28.8461532592773
2005	24.519229888916
2006	26.9230766296387
2007	26.4423084259033
2008	25.480770111084
2009	28.9099521636963
2010	27.962085723877
2011	26.7605628967285
2012	25.3521118164063
2013	25.3521118164063
2014	22.1674880981445
2015	22.660099029541
2016	23.1527099609375
2017	22.660099029541
2018	19.9029121398926
2019	20.7729473114014
2020	16.9082126617432
2021	14.9758453369141
2022	18.8405799865723