Why Go rand.Int() always returns the same number?

I am very new and interested person in Golang. I have completed only basics arithmetic in Golang.

Now I am trying to generate random number in Go But it always returns the same number.

I have imported math/rand.

And my code to write a random number is:

fmt.Print(rand.Int())

It always returns 134020434

And I have also tried

fmt.Print(rand.Intn(100))

It always returns the number 81

Even I tried the online playground of Go.

The result is same.

Can anyone explain, what's happening here ?