India Bank pursued aggressive expansion. The Sugar Duties Act of 1846, which equalised the duties on sugar imported into the United Kingdom from the British colonies with that of non-British territories, created a financial crisis in Trinidad and Tobago as the price of sugar fell rapidly. The West India Bank, which had taken on too much risk, went bust during the crisis and the Colonial Bank was also put under strain. The international silver crisis of 1873 signalled the end of the silver dollar era in the West Indies and silver dollars were demonetized in Tobago in 1879 and in Trinidad at around the same period. This left a state of affairs, in which the British coinage circulated, being reckoned in the private sector using dollar accounts at an automatic conversion rate of 1 dollar = 4 shillings 2 pence. Local banks also issued their own dollars, however, denominated in dollars. Government offices kept their accounts in British pounds, shillings, and pence until the year 1935. The Currency Interpretation Ordinance of 1934 replaced the system of pounds, shillings and pence with the dollar, retaining the fixed exchange rate of 1 dollar for every 4 shillings 2 pence. From 1949, with the introduction of the British West Indies dollar, the currency of Trinidad and Tobago became officially tied up with that of the British Eastern Caribbean territories in general. The British sterling coinage was eventually replaced by a new decimal coinage in 1955, with the new cent being equal to one half of the old penny. In 1951, notes of the British Caribbean Territories, Eastern Group, were introduced, replacing Trinidad and Tobago's own notes. In 1955, coins were introduced when the dollar was decimalized. The currency of the union was replaced by the modern Trinidad and Tobago dollar in 1964, two years after the nation's independence in 1962. The Trinidad and Tobago dollar was launched, and had become the sole currency by 1967. In 1964, Trinidad and Tobago introduced its own dollar. Between 1964 and 1968 the Trinidad and Tobago dollar was utilized in Grenada as legal tender until that country rejoined the common currency arrangements of the East Caribbean dollar. The Trinidad and Tobago dollar and the Eastern Caribbean dollar were the last two currencies in the world to retain the old rating of one pound equals four dollars and eighty cents, as per the gold sovereign to the Pieces