You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when did the green revolution take place in india?" whose answer is the early 1960s.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did the green revolution start and end in india
Useful Output:

Doc 1: Once India's 1965-67 drought ended and the Green Revolution began, wheat production sped up, while production trends in other crops like rice,
Doc 2: Answer: The Green Revolution was started in India as a response to long suffered humiliation. It started in the mid 1960's and effectively
Doc 3: The Green Revolution, spreading over the period from 1967-68 to 1977-78, changed India's status from a food-deficient country to one of the
Doc 4: The term Green Revolution refers to the renovation of agricultural practices beginning in Mexico in the 1940s.  India, for example, was
Doc 5: The program started with research for the development of suitable hybrids of maize followed by hybrids of sorghum and pearl millet.