Year	Number
1996	22.8260860443115
1998	22.8260860443115
2000	20.6521739959717
2002	21.0810813903809
2003	20.5405406951904
2004	23.3830852508545
2005	20.5882358551025
2006	22.0588226318359
2007	22.3300971984863
2008	28.1553401947021
2009	26.3157901763916
2010	30.6220092773438
2011	25.1184825897217
2012	24.6445503234863
2013	22.748815536499
2014	25.480770111084
2015	24.761905670166
2016	20.4761905670166
2017	23.8095245361328
2018	25.238094329834
2019	28.0952377319336
2020	25.7142848968506
2021	26.6666660308838
2022	26.4150943756104