Why despite the implementation of Green Revolution, 65% of our population

Why despite the implementation of Green Revolution, 65% of our population continued to be
engaged in the agriculture sector till 1990?

Although with the advent of Green Revolution, Indian agricultural production increased substantially that enabled India to attain the status of self-sufficiency in foodgrains. This increase is substantial only in comparison to foodgrain production in the past India failed to achieve structural transformation associated with the economic growth and development.
The industrial and service sector in India faile4 to generate significant employment opportunities in order to attract and absorb excess agriculture labour.
The industrial and service sector growth was not very significant and thus, could not provide employment opportunities to the surplus labour from agricultural sector leading to disguised unemployment in agriculture. The slow growth of secondary and tertiary sector has been responsible for majority of population (approx 65 %) remaining in agricultural occupation till 1990.