Year	Number
1996	1.34866082668304
1998	1.33687722682953
2000	1.31016671657562
2002	1.34456813335419
2003	1.33822762966156
2004	1.327751994133
2005	1.29452359676361
2006	1.1016218662262
2007	1.10981047153473
2008	1.14426684379578
2009	1.09722805023193
2010	1.1336270570755
2011	1.12696576118469
2012	1.16158699989319
2013	1.10301864147186
2014	1.07124829292297
2015	1.1098393201828
2016	1.11025989055634
2017	1.00634932518005
2018	0.99573165178299
2019	0.905322194099426
2020	0.855865716934204
2021	0.878146708011627
2022	0.84512186050415