Year	Number
1996	0.187617555260658
1998	0.302315533161163
2000	0.331546425819397
2002	0.259350627660751
2003	0.298997640609741
2004	0.325737655162811
2005	0.224412888288498
2006	0.296224117279053
2007	0.297346860170364
2008	0.296866953372955
2009	0.294009476900101
2010	0.302436739206314
2011	0.296791970729828
2012	0.260998487472534
2013	0.252568811178207
2014	0.28580966591835
2015	0.275554895401001
2016	0.283764690160751
2017	0.293822139501572
2018	0.292914599180222
2019	0.293495029211044
2020	0.305667519569397
2021	0.308144867420197
2022	0.320557087659836