Year	Number
2004	0.638970971107483
2005	1.28759801387787
2006	1.27981781959534
2007	1.24660122394562
2008	1.27092468738556
2009	1.2766444683075
2010	1.25646901130676
2011	1.24453473091125
2012	1.26281690597534
2013	1.27128553390503
2014	1.20296061038971
2015	1.22183477878571
2016	1.27648758888245
2017	0.783603131771088
2018	0.774844706058502
2019	0.76248824596405
2020	0.632899343967438
2021	0.639231383800507
2022	0.667918145656586