 Another regulation prohibited any ship transporting Indian indentured labourers from setting sail between the end of March and the beginning of August.Any shipping company that violated the regulations would be prohibited from transporting contact workers in the future.While the mortality rate among slaves working on plantations between 1680 and 1807 averaged 50.9 per thousand people, following the passage of the regulations post-1873, it dropped to 7.1 per thousand among Indian workers.