Year	Number
1996	5.02512550354004
1998	6
2000	4.47761201858521
2002	9.45273590087891
2003	11.9402980804443
2004	12.9807691574097
2005	16.2679424285889
2006	11.4832534790039
2007	11.9617223739624
2008	12.9807691574097
2009	13.7440757751465
2010	12.3222751617432
2011	11.7370891571045
2012	12.2065725326538
2013	16.4319248199463
2014	16.3461532592773
2015	14.7619047164917
2016	19.5238094329834
2017	20.4761905670166
2018	19.0476188659668
2019	20
2020	16.6666660308838
2021	21.4285717010498
2022	19.8113212585449