Year	Number
2002	21.0877
2004	24.75952
2007	28.36226
2009	29.76829
2010	30.10466
2011	26.54315
2012	26.67088
2013	26.63606
2014	26.27563
2015	26.69519
2016	26.24921
2017	26.41088
2018	26.3074