Year	Number
1996	16.5
1998	12.93532371521
2000	11.9402980804443
2002	10.4477615356445
2003	7.46268653869629
2004	6.73076915740967
2005	6.25
2006	6.73076915740967
2007	6.73076915740967
2008	6.73076915740967
2009	8.05687236785889
2010	9.95260620117188
2011	9.38967132568359
2012	12.2065725326538
2013	12.6760559082031
2014	10.837438583374
2015	11.3300495147705
2016	12.3152713775635
2017	12.3152713775635
2018	13.5922327041626
2019	14.4927539825439
2020	15.4589376449585
2021	14.9758453369141
2022	18.3574886322021