Year	Number
1996	21.3114757537842
1998	15.8469944000244
2000	12.021858215332
2002	9.72972965240479
2003	12.4324321746826
2004	4.97512435913086
2005	12.7450981140137
2006	5.36585378646851
2007	10.1941747665405
2008	14.5631065368652
2009	19.1387557983398
2010	11.0047845840454
2011	9.00473976135254
2012	17.5355453491211
2013	9.95260620117188
2014	14.9038457870483
2015	18.0952377319336
2016	15.2380952835083
2017	17.1428565979004
2018	14.7619047164917
2019	11.9047622680664
2020	9.5238094329834
2021	12.380952835083
2022	13.2075471878052