Year	Number
1996	1.45682156085968
1998	1.39918959140778
2000	1.39177203178406
2002	1.47525751590729
2003	1.34161329269409
2004	1.36222684383392
2005	1.29990482330322
2006	1.29393398761749
2007	1.27147829532623
2008	1.12833654880524
2009	1.08463823795319
2010	1.09417045116425
2011	1.23068809509277
2012	1.17059719562531
2013	1.12777805328369
2014	1.06541478633881
2015	0.932670474052429
2016	1.00078213214874
2017	0.968601584434509
2018	0.921225249767303
2019	1.01176965236664
2020	0.99729984998703
2021	1.01436281204224
2022	0.902623057365417