Year	Number
2003	27.54296
2004	28.8882
2005	28.66179
2006	27.86807
2007	27.26688
2008	26.74344
2009	23.99372
2010	25.13398
2011	24.72253
2012	25.70554
2013	23.4811
2014	23.22809
2015	22.98212
2016	23.0195