Year	Number
1996	1.05642402172089
1998	0.801862299442291
2000	0.83810555934906
2002	0.740141987800598
2003	0.688429892063141
2004	0.590003907680511
2005	0.509243011474609
2006	0.379006385803223
2007	0.467548191547394
2008	0.447921454906464
2009	0.399145483970642
2010	0.454773187637329
2011	0.483442842960358
2012	0.425940155982971
2013	0.436367183923721
2014	0.42237776517868
2015	0.288587987422943
2016	0.367524951696396
2017	0.319811522960663
2018	0.240896880626678
2019	0.273004680871964
2020	0.207708835601807
2021	0.240628808736801
2022	0.297009468078613