Year	Number
1996	1.04677295684814
1998	1.23299062252045
2000	1.39622569084167
2002	1.49393892288208
2003	1.51915323734283
2004	1.42412769794464
2005	1.33475089073181
2006	1.22523212432861
2007	1.31363642215729
2008	1.29860198497772
2009	1.00787806510925
2010	1.07453846931458
2011	1.07407629489899
2012	1.02571737766266
2013	1.0395964384079
2014	1.0803724527359
2015	1.06393361091614
2016	0.763969719409943
2017	0.626516401767731
2018	0.363926589488983
2019	0.324169725179672
2020	0.296676337718964
2021	0.34103798866272
2022	0.358760207891464