Year	Number
1996	50.5
1998	55.7213935852051
2000	51.243782043457
2002	51.7412948608398
2003	55.7213935852051
2004	52.4038467407227
2005	55.769229888916
2006	58.1730766296387
2007	61.0576934814453
2008	58.1730766296387
2009	58.2938385009766
2010	57.3459701538086
2011	54.9295768737793
2012	55.3990592956543
2013	55.3990592956543
2014	49.7536964416504
2015	48.7684745788574
2016	45.8128089904785
2017	48.2758636474609
2018	52.9126205444336
2019	53.1400947570801
2020	56.038646697998
2021	57.9710159301758
2022	58.937198638916