Year	Number
1996	20.7446804046631
1998	30.8510646820068
2000	39.1534385681152
2002	45.5026473999023
2003	40.2010040283203
2004	38.3495140075684
2005	33.4951438903809
2006	26.57004737854
2007	23.6714973449707
2008	19.230770111084
2009	22.274881362915
2010	23.222749710083
2011	26.0663509368896
2012	24.6445503234863
2013	23.222749710083
2014	17.619047164917
2015	21.4285717010498
2016	23.8095245361328
2017	17.619047164917
2018	22.6415100097656
2019	17.9245281219482
2020	19.3396224975586
2021	23.1132068634033
2022	21.698112487793