Year	Number
1979	28.68096
2005	9.56997
2007	10.93579
2008	10.35374
2009	10.50588
2010	10.28357
2011	10.2927
2012	10.68961
2013	9.63006
2014	10.81629
2015	13.08992
2016	10.8231
2017	11.33396
2018	15.03757