Year	Number
1993	1.2293636940321653
1994	2.3339111509624124
1995	2.420110472164702
1996	2.716452435853814
1997	2.5882234348550273
1998	3.0436133870246334
1999	3.4551251243447405
2000	4.52674440019691
2001	5.250641398501654
2002	5.328067080433609
2003	5.512241083771154
2004	5.107125275531828
2005	4.6621594073375805
2006	5.312652999803392
2007	5.270195259467671
2008	4.168635312959491
2009	6.506851018495305
2010	6.5527213849083505
2011	6.045929377220318
2012	6.7286126315485095
2013	7.865948384324496
2014	6.72466290970334
2015	7.484119522800027
2016	6.707148814532467
2017	7.868134954827496
2018	6.9601426646719275
2019	7.088895547701132
2020	9.257667197113218
2021	8.452493309609265
2022	7.021944438805215
2023	0.7316494854352567