Year	Number
1996	36.9565200805664
1998	25
2000	19.5652179718018
2002	21.6216220855713
2003	25.4054050445557
2004	19.9004974365234
2005	22.0588226318359
2006	19.6078433990479
2007	17.9611644744873
2008	17.9611644744873
2009	21.0526313781738
2010	19.6172256469727
2011	16.1137447357178
2012	22.274881362915
2013	18.9573459625244
2014	22.5961532592773
2015	21.4285717010498
2016	20.9523811340332
2017	19.5238094329834
2018	25.7142848968506
2019	23.8095245361328
2020	29.5238094329834
2021	28.0952377319336
2022	30.6603775024414