Year	Number
1996	20.7650279998779
1998	25.6830596923828
2000	26.2295074462891
2002	22.1621627807617
2003	29.1891899108887
2004	28.3582096099854
2005	15.6862745285034
2006	19.5121955871582
2007	16.019416809082
2008	18.9320392608643
2009	20.0956935882568
2010	18.1818180084229
2011	18.4834117889404
2012	21.8009471893311
2013	21.3270149230957
2014	19.7115383148193
2015	24.761905670166
2016	21.4285717010498
2017	18.5714282989502
2018	18.0952377319336
2019	21.9047622680664
2020	17.1428565979004
2021	15.2380952835083
2022	14.6226415634155