Year	Number
1996	1.2536518573761
1998	1.30039668083191
2000	1.55263936519623
2002	1.50557315349579
2003	1.63000345230103
2004	1.61270821094513
2005	1.60232031345367
2006	1.52669358253479
2007	1.50993680953979
2008	1.31083500385284
2009	1.01376235485077
2010	0.920679152011871
2011	1.05194532871246
2012	1.11312413215637
2013	1.13294076919556
2014	1.21289432048798
2015	1.2609771490097
2016	1.26583850383759
2017	1.42281877994537
2018	1.40824568271637
2019	1.36299002170563
2020	1.44301211833954
2021	1.52774238586426
2022	1.30729651451111