According to Sahin (2014) were 16.1%, Abdel-Salam (2017) were 10.4%, Memetoglu (2015) were 20%, Schulman (2015) were 18 17.8%.
Theo Sahin (2014) là 16,1%, Abdel-Salam (2017) là 10,4%, Memetoglu (2015) là 20%, Schulman (2015) là 17,8%.