Year	Number
1996	1.33797693252563
1998	1.09743523597717
2000	1.00555968284607
2002	1.07848691940308
2003	1.10024511814117
2004	1.11775302886963
2005	1.1556099653244
2006	0.937738180160522
2007	1.18673837184906
2008	1.06214225292206
2009	1.13757157325745
2010	1.15724182128906
2011	1.15227234363556
2012	1.17844355106354
2013	1.15845036506653
2014	1.03544294834137
2015	0.919540107250214
2016	0.834684908390045
2017	0.809503495693207
2018	0.907250463962555
2019	0.863591849803925
2020	0.70538467168808
2021	0.592204332351685
2022	0.546773970127106