Year	Number
1993	5.128306080783654
1994	1.4987977494010685
1995	1.379568898729082
1996	1.3071037412377189
1997	1.2079911304253346
1998	0.7452342692641918
1999	0.7448489703645351
2000	0.7768254617792264
2001	0.8062286983052657
2002	0.8085375429843487
2003	0.8540766193019534
2004	0.9539712415607647
2005	1.047062831720588
2006	1.2043041739371105
2007	1.3002115828734844
2008	1.1123430839527348
2009	1.1864307982640296
2010	1.2253961300044198
2011	1.2341939681353773
2012	1.477608582861789
2013	1.7167065784493103
2014	1.8423761761614654
2015	1.7718430038328226
2016	1.73889620658733
2017	1.6026459947000682
2018	1.6911888010422724
2019	1.5535992493208797
2020	1.564184661601827
2021	1.9130844038522972
2022	2.354939980392432