Year	Number
1993	0.47712243876833377
1994	1.5238902047318146
1995	1.5980885111104828
1996	2.302954019939008
1997	2.7345386567207757
1998	3.5291837838817597
1999	3.0050751187812215
2000	2.990451454314034
2001	3.1737812968488512
2002	3.6890454645707713
2003	3.5454029329575394
2004	3.3107392276178
2005	2.82393035198286
2006	2.83641647753351
2007	4.421354480385643
2008	4.8280438129820675
2009	6.228970082398169
2010	5.6044446553154
2011	4.755023017780452
2012	4.874748848780906
2013	4.422740816021827
2014	4.769180775984306
2015	5.2435914404377275
2016	6.083657688159338
2017	7.384127669045842
2018	7.386130823244531
2019	8.099348718007885
2020	10.31642077824887
2021	7.022587906401961
2022	5.827670739255662