Year	Number
1996	20.218578338623
1998	20.7650279998779
2000	20.7650279998779
2002	16.7567558288574
2003	20.5405406951904
2004	21.3930339813232
2005	15.1960783004761
2006	18.536584854126
2007	15.5339803695679
2008	13.1067962646484
2009	16.2679424285889
2010	21.5311012268066
2011	22.748815536499
2012	20.8530807495117
2013	14.6919431686401
2014	19.7115383148193
2015	30.9523811340332
2016	32.3809509277344
2017	30.4761905670166
2018	18.0952377319336
2019	14.2857141494751
2020	7.61904764175415
2021	10
2022	8.96226406097412