Year	Number
1996	1.62955820560455
1998	1.55780613422394
2000	1.67868137359619
2002	1.50104343891144
2003	1.61011552810669
2004	1.65317785739899
2005	1.62860155105591
2006	1.49936544895172
2007	1.47794735431671
2008	1.47838854789734
2009	1.47848224639893
2010	1.50750553607941
2011	1.57907593250275
2012	1.61772203445435
2013	1.60607767105103
2014	1.52441298961639
2015	1.5548654794693
2016	1.5332738161087
2017	1.55807733535767
2018	1.60416686534882
2019	1.53711998462677
2020	1.59581446647644
2021	1.59364664554596
2022	1.63967132568359