Year	Number
1996	29.0322589874268
1998	32.6203193664551
2000	32.4468078613281
2002	31.7460308074951
2003	37.5661392211914
2004	32.019702911377
2005	31.7073173522949
2006	26.8292675018311
2007	21.8446598052979
2008	18.4466018676758
2009	19.1387557983398
2010	20.9523811340332
2011	20.3791465759277
2012	21.3270149230957
2013	21.8009471893311
2014	27.4038467407227
2015	25.238094329834
2016	31.9047622680664
2017	25.7142848968506
2018	29.0476188659668
2019	30.9523811340332
2020	26.6666660308838
2021	28.0952377319336
2022	24.5283012390137