Year	Number
1993	0.535743486727473
1994	0.9687253786756298
1995	1.7466369392856445
1996	2.147419749234831
1997	2.818960131964255
1998	3.3664712603917577
1999	3.866500956630848
2000	3.658244916249134
2001	3.521153784650429
2002	4.100495818908451
2003	3.7583803467717085
2004	3.2725352844555253
2005	3.187633860988304
2006	4.236971947642285
2007	4.593343155943728
2008	3.0620977103222375
2009	5.412026264368282
2010	4.366228466087518
2011	4.123849730651661
2012	3.707780724619194
2013	4.463321014570659
2014	2.8930800461972273
2015	4.368414251935976
2016	5.214876353822131
2017	4.431890102103324
2018	3.6689814849964923
2019	4.0890307415568
2020	5.469285610956429
2021	5.53215985512179
2022	4.222949443321511
2023	2.748712870754093