Year	Number
1996	1.05037176609039
1998	1.08426582813263
2000	1.28314232826233
2002	0.903408944606781
2003	0.645857214927673
2004	0.655790030956268
2005	0.931847214698792
2006	0.912748575210571
2007	0.787657201290131
2008	0.7489093542099
2009	0.598137140274048
2010	0.856766223907471
2011	0.937754094600677
2012	0.744266331195831
2013	0.825588941574097
2014	0.361632436513901
2015	0.674569547176361
2016	0.715953171253204
2017	0.779472529888153
2018	0.673826813697815
2019	0.65869414806366
2020	0.701772809028625
2021	0.744613945484161
2022	0.756404340267181