Year	Number
2002	1.2750111161
2003	1.3608587944
2004	1.3492028203
2005	1.3682589087
2006	1.4103093438
2007	1.4472463952
2008	1.4742107603
2009	1.5335704758
2010	1.5006669631
2011	1.4937750111
2012	1.4695420187
2013	1.5671409515
2014	1.5371276123
2015	1.5195642508
2016	1.4804357492
2017	1.4959982214
2018	1.4962205425
2019	1.4895509115
2020	1.4784348599