Year	Number
1996	1.60150218009949
1998	1.65966057777405
2000	1.79679453372955
2002	1.85915970802307
2003	1.91875457763672
2004	1.90612423419952
2005	1.93932402133942
2006	1.88209331035614
2007	1.82779610157013
2008	1.8531905412674
2009	1.70691537857056
2010	1.70661580562592
2011	1.68856692314148
2012	1.67797338962555
2013	1.65392100811005
2014	1.70472538471222
2015	1.6339955329895
2016	1.48363721370697
2017	1.5700169801712
2018	1.67916393280029
2019	1.72634088993073
2020	1.75132393836975
2021	1.712641954422
2022	1.70302581787109