Year	Number
1996	2.12765955924988
1998	0.531914889812469
2000	8.99470901489258
2002	3.17460322380066
2003	4.52261304855347
2004	8.73786449432373
2005	11.1650485992432
2006	8.69565200805664
2007	15.4589376449585
2008	10.5769233703613
2009	9.00473976135254
2010	12.3222751617432
2011	15.1658763885498
2012	16.1137447357178
2013	19.9052124023438
2014	23.8095245361328
2015	20.4761905670166
2016	21.9047622680664
2017	19.5238094329834
2018	18.3962268829346
2019	16.5094337463379
2020	18.3962268829346
2021	18.3962268829346
2022	16.9811325073242