Year	Number
1996	9.04522609710693
1998	9.5
2000	9.45273590087891
2002	17.9104480743408
2003	11.4427862167358
2004	10.5769233703613
2005	7.17703342437744
2006	13.3971290588379
2007	11.9617223739624
2008	10.0961542129517
2009	16.5876770019531
2010	12.7962083816528
2011	14.0845069885254
2012	15.962441444397
2013	15.023473739624
2014	18.269229888916
2015	14.7619047164917
2016	15.7142858505249
2017	20.4761905670166
2018	19.0476188659668
2019	18.5714282989502
2020	20.4761905670166
2021	17.1428565979004
2022	16.5094337463379