Year	Number
1996	1.56270956993103
1998	1.49381899833679
2000	1.52600920200348
2002	1.48717486858368
2003	1.52924609184265
2004	1.70420897006989
2005	1.6405930519104
2006	1.54217982292175
2007	1.54985499382019
2008	1.54803907871246
2009	1.54887938499451
2010	1.59508776664734
2011	1.62635803222656
2012	1.72816324234009
2013	1.73797512054443
2014	1.68411779403687
2015	1.68793427944183
2016	1.66489601135254
2017	1.69441366195679
2018	1.70854437351227
2019	1.65307128429413
2020	1.71944141387939
2021	1.73818778991699
2022	1.77486836910248