Year	Number
2005	14.73024
2006	14.54589
2007	14.29825
2008	13.45496
2009	12.65596
2010	12.6035
2011	12.48498
2012	12.78353
2013	12.77789
2014	11.99279
2015	11.26358
2016	10.36068
2017	10.02403
2018	9.86006