Year	Number
1996	21.608039855957
1998	23
2000	12.93532371521
2002	29.3532333374023
2003	27.3631839752197
2004	16.8269233703613
2005	16.2679424285889
2006	18.6602878570557
2007	13.8755979537964
2008	13.4615383148193
2009	11.8483409881592
2010	13.7440757751465
2011	15.023473739624
2012	14.0845069885254
2013	17.3708915710449
2014	17.7884616851807
2015	21.4285717010498
2016	13.8095235824585
2017	11.9047622680664
2018	10
2019	10.9523811340332
2020	8.5714282989502
2021	9.5238094329834
2022	8.49056625366211