Year	Number
1996	0.386360377073288
1998	0.440841853618622
2000	0.416249960660934
2002	0.366997271776199
2003	0.276095181703568
2004	0.298770993947983
2005	0.199838370084763
2006	0.259519100189209
2007	0.271351486444473
2008	0.216206818819046
2009	0.216449201107025
2010	0.208097830414772
2011	0.211273431777954
2012	0.230768129229546
2013	0.238375931978226
2014	0.285645455121994
2015	0.274665802717209
2016	0.290534406900406
2017	0.291876524686813
2018	0.30007192492485
2019	0.307287633419037
2020	0.335054785013199
2021	0.325010359287262
2022	0.30890029668808