Year	Number
2003	26.258
2004	27.73489
2005	27.00826
2006	26.11246
2007	25.50813
2008	25.43738
2009	23.05381
2010	26.44469
2011	24.11815
2012	25.03671
2013	22.62245
2014	22.45603
2015	22.07316
2016	22.19245