Year	Number
1996	9.78260898590088
1998	8.69565200805664
2000	9.2391300201416
2002	21.0810813903809
2003	17.8378372192383
2004	7.46268653869629
2005	11.2745094299316
2006	17.1568622589111
2007	13.5922327041626
2008	16.990291595459
2009	12.9186601638794
2010	11.4832534790039
2011	13.2701425552368
2012	11.3744077682495
2013	11.8483409881592
2014	9.61538505554199
2015	10.4761905670166
2016	10
2017	9.5238094329834
2018	9.0476188659668
2019	8.09523773193359
2020	9.0476188659668
2021	9.0476188659668
2022	9.90566062927246