Year	Number
2006	0.7974747915222619
2007	1.0888427142452697
2008	1.5512190978568854
2009	1.1714646163692302
2010	1.3155507669524473
2011	1.3130029548484845
2012	1.295743211824658
2013	1.3064552759138661
2014	1.7346455522345445
2015	1.5954404353727407
2016	1.8368206971564547
2017	1.773504300031756
2018	2.0205243912027355
2019	1.789107537421046
2020	1.9488452697043872
2021	2.0417245925458207
2022	1.7483495927159058
2023	1.521859719448221