Year	Number
1996	0.530793964862823
1998	0.509318709373474
2000	0.539500534534454
2002	0.56650322675705
2003	0.59114670753479
2004	0.313118994235992
2005	0.260035753250122
2006	0.279324263334274
2007	0.267796158790588
2008	0.215857669711113
2009	0.208600103855133
2010	0.207402378320694
2011	0.209465220570564
2012	0.213596984744072
2013	0.213405340909958
2014	0.234696194529533
2015	0.226384788751602
2016	0.31649187207222
2017	0.309462517499924
2018	0.314283728599548
2019	0.303756207227707
2020	0.334380000829697
2021	0.328474462032318
2022	0.308978110551834