Year	Number
1996	1.23934519290924
1998	1.23770523071289
2000	1.27266025543213
2002	1.37723803520203
2003	1.53715085983276
2004	1.63809645175934
2005	1.69587361812592
2006	1.57389867305756
2007	1.59572398662567
2008	1.59489285945892
2009	1.55884337425232
2010	1.61884760856628
2011	1.66075348854065
2012	1.72407805919647
2013	1.69718194007874
2014	1.82065498828888
2015	1.77878141403198
2016	1.78596162796021
2017	1.78407096862793
2018	1.80267703533173
2019	1.83781433105469
2020	1.8356260061264
2021	1.82000410556793
2022	1.77927768230438