Year	Number
1996	13.043478012085
1998	17.9347820281982
2000	20.6521739959717
2002	15.6756753921509
2003	18.3783779144287
2004	23.3830852508545
2005	20.5882358551025
2006	21.0784320831299
2007	20.8737869262695
2008	20.8737869262695
2009	24.4019145965576
2010	25.3588523864746
2011	23.222749710083
2012	20.8530807495117
2013	18.0094795227051
2014	19.230770111084
2015	16.1904754638672
2016	22.380952835083
2017	18.5714282989502
2018	19.5238094329834
2019	17.1428565979004
2020	20.4761905670166
2021	16.6666660308838
2022	19.3396224975586