Year	Number
1996	0.373912304639816
1998	0.345668405294418
2000	0.342506408691406
2002	0.316015273332596
2003	0.301584661006927
2004	0.286855816841125
2005	0.278116136789322
2006	0.273782998323441
2007	0.262691110372543
2008	0.263591170310974
2009	0.246055126190186
2010	0.243547096848488
2011	0.238522350788116
2012	0.21966552734375
2013	0.225787356495857
2014	0.192247405648232
2015	0.196433380246162
2016	0.203295975923538
2017	0.209813088178635
2018	0.208318024873734
2019	0.223971575498581
2020	0.226481333374977
2021	0.22979348897934
2022	0.226615026593208