How many times Indian rupee got devalued and when?

Since its Independence in 1947, India has faced two major financial crises and two consequent

devaluations of the rupee. These crises were in 1966 and 1991 and, as we plan to show in this paper,

they had similar causes.

1.

In 1966 it was devaluated upto 36.5 %

2.

In 1991 it was devaluated upto 18-19 %