Prime Minister Syed Yusuf Raza Gilani on Saturday said that the government had taken a number steps to improve facilities at the Karachi Port Trust as the shipping was the backbone of economic activity in the country. Addressing a function here at Karachi Port Trust to mark the launching of Phase-2 of the Reconstruction of Berths, the Prime Minister said the KPT had been a centre of progress and the nation was proud of its achievements in making this city one of the major maritime terminals of South Asia.