Year	Number
1996	1.09829199314117
1998	1.11441886425018
2000	1.11794853210449
2002	1.09297561645508
2003	0.95275342464447
2004	0.928724050521851
2005	0.924126982688904
2006	0.929085612297058
2007	0.934261023998261
2008	0.971235871315002
2009	0.954712569713593
2010	1.02448236942291
2011	0.802048742771149
2012	0.796869933605194
2013	0.819821715354919
2014	0.993937194347382
2015	1.0171754360199
2016	0.836897432804108
2017	0.836443364620209
2018	0.640359580516815
2019	0.656735599040985
2020	0.673558413982391
2021	0.705153167247772
2022	0.71289449930191