From July 1, 2017, the nationwide GST (Goods & Services Tax) has been rolled out in India, making the country a single market. What is the current size of Indian economy?

Q. From July 1, 2017, the nationwide GST (Goods & Services Tax) has been rolled out in India, making the country a single market. What is the current size of Indian economy?
Answer: USD 2 Trillion
Notes: India is a USD 2 trillion economy with around 1.3 billion people.