Year	Number
1996	1.53897178173065
1998	1.46734094619751
2000	1.53596532344818
2002	1.53286790847778
2003	1.60145223140717
2004	1.80099177360535
2005	1.73960888385773
2006	1.57163619995117
2007	1.47770440578461
2008	1.53830599784851
2009	1.53825998306274
2010	1.54195690155029
2011	1.55170702934265
2012	1.67411422729492
2013	1.66627061367035
2014	1.52460658550262
2015	1.55284702777863
2016	1.5414125919342
2017	1.51776885986328
2018	1.57350194454193
2019	1.54312837123871
2020	1.51466250419617
2021	1.545294880867
2022	1.58586609363556