Year	Number
1996	1.1568101644516
1998	1.29537415504456
2000	1.30232381820679
2002	1.41555559635162
2003	1.40778958797455
2004	1.4110358953476
2005	1.32878684997559
2006	1.34319972991943
2007	1.32800912857056
2008	1.33007168769836
2009	1.3600195646286
2010	1.34837675094604
2011	1.34685218334198
2012	1.31606793403625
2013	1.33461117744446
2014	1.30873775482178
2015	1.09777593612671
2016	1.06738793849945
2017	1.13446974754333
2018	1.09553563594818
2019	1.10244631767273
2020	1.10620594024658
2021	1.15245354175568
2022	1.25618994235992