Year	Number
1996	1.05396950244904
1998	1.2612122297287
2000	1.3641529083252
2002	1.47494268417358
2003	1.53995966911316
2004	1.31331741809845
2005	1.41586935520172
2006	1.55562663078308
2007	1.61292576789856
2008	1.6136599779129
2009	1.47365593910217
2010	1.41011226177216
2011	1.27858006954193
2012	1.33850824832916
2013	1.32573401927948
2014	1.19122016429901
2015	1.10639786720276
2016	0.967930018901825
2017	1.11081969738007
2018	1.01952743530273
2019	0.921010732650757
2020	0.883519530296326
2021	0.836222589015961
2022	0.787202715873718