Year	Number
1996	2.13895487785339
1998	2.16226291656494
2000	2.12334966659546
2002	2.11497449874878
2003	2.01096653938293
2004	1.9128645658493
2005	2.00025272369385
2006	2.12355327606201
2007	1.9825838804245
2008	1.89187574386597
2009	1.98498344421387
2010	2.07725214958191
2011	2.14263248443604
2012	2.24798226356506
2013	2.2868275642395
2014	2.2228946685791
2015	2.2004222869873
2016	2.14937162399292
2017	2.19047498703003
2018	2.05011701583862
2019	2.03383588790894
2020	2.06585383415222
2021	2.10870814323425
2022	2.0677604675293