Changes in song direction

This is how the direction in Indian movies has changed since years. The thing I am pointing out is the combined root mean squared deviation of the Hero and Heroine in the song.

First one shows the least deviation – As if they have crystallized. They do not even move 10 cms in the entire song.

Second one shows as if they are normal human beings.

Third one shows a high averaged value of root mean square deviation of all Heroes and Heroines.