Passage: The first English settlement in the Presidency known as Western Presidency was begun in 1618 at Surat in present-day Gujarat, when the East India Company established a factory, protected by a charter obtained from the Mughal Emperor Jahangir. In 1626 the Dutch and the English made an unsuccessful attempt to gain possession of the island of Bombay in the coastal Konkan region from Portugal, and in 1653 proposals were suggested for its purchase from the Portuguese. In 1661 Bombay was ceded to the Kingdom of England as part of the dowry of the infanta Catherine of Braganza on her marriage to King Charles II. So lightly was the acquisition esteemed in England, and so unsuccessful was the administration of the crown officers, that in 1668 Bombay was transferred to the East India Company for an annual payment of £10, and the Company established a factory there. At the time of the transfer, powers for the island's defence and for the administration of justice were also conferred on the Company; a European regiment1 was enrolled; and fortifications were erected which in 1673 proved sufficient to deter the Dutch from an intended attack. As English trade in Bombay increased, Surat (which had been sacked by Shivaji in 1670) began its relative decline. In 1687, Bombay was made the headquarters of all the East India Company's possessions in India. However, in 1753 the governor of Bombay became subordinate to that of Calcutta.

Question: What year did Bombay begin to be the main hub for all the East India Company's wealth in India?
1687