Curious numbers

From Sandip Das' "In trade we trust" in The Financial Express, 11 April 2010, quoting from the book "Back to the Future: Roots of Commodity Trade in India" by Jignesh Shah & Biswajeet Rath:

"In the first millennium, India contributed 33% of the world GDP and was the world’s largest economy. The country was also one of the world’s biggest exporter of goods such as textiles, steel and iron products, and spices until the 11th century. At the onset of the 17th century, more than half of the world’s exports were from India and China."