Year	number
2005	38.660377358490564
2006	38.425925925925924
2007	38.46296296296296
2008	38.388888888888886
2009	38.27272727272727
2010	38.25454545454546
2011	37.872727272727275
2012	37.89473684210526
2013	38.10344827586207
2014	37.706896551724135
2015	37.44827586206897
2016	36.48275862068966
2017	35.44827586206897
2018	35.327586206896555
2019	34.13793103448276