Year	Number
1996	12.2340421676636
1998	15.957447052002
2000	10.582010269165
2002	24.8677253723145
2003	14.5728645324707
2004	7.76699018478394
2005	11.6504850387573
2006	19.3236713409424
2007	18.8405799865723
2008	20.1923084259033
2009	17.0616111755371
2010	18.4834117889404
2011	17.0616111755371
2012	20.8530807495117
2013	22.274881362915
2014	14.7619047164917
2015	13.8095235824585
2016	15.2380952835083
2017	24.2857151031494
2018	27.3584899902344
2019	25.943395614624
2020	22.6415100097656
2021	21.698112487793
2022	16.0377349853516