Year	Number
2004	0.276366174221039
2005	1.08485698699951
2006	0.959533631801605
2007	0.988939225673676
2008	1.12754082679749
2009	1.13620400428772
2010	1.06810534000397
2011	1.08552253246307
2012	0.969306468963623
2013	0.956631362438202
2014	0.690833389759064
2015	0.656603634357452
2016	0.674878418445587
2017	0.708770871162415
2018	0.743708729743958
2019	0.760439336299896
2020	0.797710955142975
2021	0.774260222911835
2022	0.756104052066803