Year	Number
1996	1.90792155265808
1998	1.95207500457764
2000	1.95340764522552
2002	1.90388894081116
2003	1.95863425731659
2004	1.93988859653473
2005	1.95094156265259
2006	1.95951342582703
2007	1.89684998989105
2008	1.91038119792938
2009	1.9625688791275
2010	1.96125268936157
2011	1.93953800201416
2012	1.94403350353241
2013	1.95565962791443
2014	2.1247820854187
2015	2.05311393737793
2016	2.00816488265991
2017	2.02343678474426
2018	2.0346474647522
2019	2.01298141479492
2020	2.0209972858429
2021	2.01348161697388
2022	1.95837247371674