Year	Number
1996	1.34199249744415
1998	1.31633019447327
2000	1.36238181591034
2002	1.32036375999451
2003	1.18837487697601
2004	1.50002658367157
2005	1.25225210189819
2006	1.25449228286743
2007	1.24336647987366
2008	1.16264343261719
2009	1.07115530967712
2010	1.23648881912231
2011	1.37673103809357
2012	1.36136555671692
2013	1.45392656326294
2014	1.46792757511139
2015	1.51113760471344
2016	1.50114333629608
2017	1.56213212013245
2018	1.51216089725494
2019	1.41574943065643
2020	1.46777844429016
2021	1.3952362537384
2022	1.31238234043121