Year	Number
1996	0.878931701183319
1998	1.18025457859039
2000	0.663586676120758
2002	0.940030038356781
2003	0.947933495044708
2004	0.593536019325256
2005	0.898072719573975
2006	0.784178674221039
2007	1.03668713569641
2008	1.0821361541748
2009	0.920496821403503
2010	1.05331683158875
2011	0.974757313728333
2012	1.08840095996857
2013	1.11951816082001
2014	1.03912115097046
2015	0.865759432315826
2016	0.708230555057526
2017	0.902730107307434
2018	0.736512184143066
2019	0.667275547981262
2020	0.633921086788177
2021	0.617806434631348
2022	0.44343426823616