Year	Number
1996	6.01092910766602
1998	5.46448087692261
2000	9.28961753845215
2002	7.02702713012695
2003	10.8108110427856
2004	14.4278602600098
2005	11.2745094299316
2006	13.6585369110107
2007	13.5922327041626
2008	13.1067962646484
2009	12.4401912689209
2010	18.6602878570557
2011	17.5355453491211
2012	19.4312801361084
2013	14.2180099487305
2014	21.1538467407227
2015	18.5714282989502
2016	12.380952835083
2017	10.9523811340332
2018	11.4285717010498
2019	12.380952835083
2020	21.9047622680664
2021	29.5238094329834
2022	23.5849056243896