Year	Number
1996	57.7889442443848
1998	58
2000	50.2487564086914
2002	52.2388076782227
2003	51.243782043457
2004	49.519229888916
2005	51.1961708068848
2006	49.7607650756836
2007	51.1961708068848
2008	52.4038467407227
2009	47.3933639526367
2010	46.9194297790527
2011	46.478874206543
2012	45.5399055480957
2013	46.478874206543
2014	49.519229888916
2015	50.9523811340332
2016	49.0476188659668
2017	45.7142868041992
2018	40.9523811340332
2019	41.9047622680664
2020	39.0476188659668
2021	40.9523811340332
2022	44.3396224975586