I think Chaman Chambu you din't read the article well. It says 11.5% for the past 7 fiscal years.
Anyways about the credit to Modi, look what has happened to Baroda. It was the best city to live in Gujarat and the second best city overall after big sister ahmedabad. Only because of godhra and post godhra the city has become one of the second worst (after ahmedabad :) ) now! Surat was sort of untouched by the violence at that time hence it managed to grow.