Year	Number
1996	27.8688526153564
1998	26.7759571075439
2000	30.0546455383301
2002	25.9459457397461
2003	29.1891899108887
2004	25.8706474304199
2005	24.0196075439453
2006	27.3170738220215
2007	25.2427177429199
2008	27.1844654083252
2009	26.7942581176758
2010	25.3588523864746
2011	25.1184825897217
2012	25.5924167633057
2013	17.5355453491211
2014	25
2015	23.8095245361328
2016	25.238094329834
2017	23.8095245361328
2018	21.9047622680664
2019	30.9523811340332
2020	20.4761905670166
2021	25.7142848968506
2022	19.3396224975586