Polyurethane

Hi all,

I am a MBA student undergoing a summer internship Project regarding MDI market in Polyurethane manufactuing. As a part of the project i need to make a survey in order to Know about the "preference of MDI producer brand like Bayer,BASF,Nippon,Huntsman, and Dow chemicals in order to manufacture polyurethane"

Kindly reply your preferences in the following format on a 7 point scale where '1' means never preferred '2' most preferred :
{Bayer,BASF,Nippon,Huntsman,Dow}={7,6,5,4,3}

Thank you