Year	Number
1996	1.15836250782013
1998	1.17725396156311
2000	1.28616547584534
2002	1.22384059429169
2003	1.05598330497742
2004	1.1943244934082
2005	0.966194272041321
2006	0.855685830116272
2007	1.16824507713318
2008	1.1863876581192
2009	1.21778512001038
2010	1.19792461395264
2011	1.3992737531662
2012	1.40118777751923
2013	1.40149104595184
2014	1.63832545280457
2015	1.51298904418945
2016	1.51331186294556
2017	1.5349280834198
2018	1.53662586212158
2019	1.51048481464386
2020	1.61627840995789
2021	1.64212965965271
2022	1.48544991016388