Year	Number
1996	1.23704397678375
1998	1.11163866519928
2000	1.30202329158783
2002	1.15553212165833
2003	1.14442586898804
2004	1.36943471431732
2005	1.21265983581543
2006	1.12335515022278
2007	1.10710692405701
2008	1.12561905384064
2009	1.38712668418884
2010	1.27754700183868
2011	1.08519375324249
2012	0.909327208995819
2013	1.07402229309082
2014	1.26150703430176
2015	1.23371255397797
2016	1.14201784133911
2017	1.1534252166748
2018	1.2358136177063
2019	1.11096370220184
2020	1.18799841403961
2021	1.17165172100067
2022	1.25736796855927