How Indian laws on sexual crimes have evolved

A video on Indian Laws on Sexual Crimes:
After the rape and murder of a veterinarian in Hyderabad on November 28 and the burning of a rape survivor in Unnao, Uttar Pradesh, on December 5, there has been an outcry for justice for the victims. Within and outside Parliament there has been a clamour to make the criminal justice system tougher on an offender committing sexual crimes against women and children. So, how have they changed over the years? When was the death penalty clause included?
Also read: https://www.thehindu.com/news/national/what-are-the-laws-on-rape-and-sexual-crimes/article30233033.ece