Hello Santosh Giri: Even Bush does not know the exact casualty data of his own citizen of Katrina devastation, then you are asking us a tough question to answer here. There is no such a thing called absolute truth, so I am relying here on my average. Let's suppose the total population of Nepal is 28x10e6, so I guess it is in between- 28x10e6 / 28 x 0.1 to 28x10e6 / 28 x 0.4. My data is based on my rough imagination with Seusi Dai et al's data and not to mention legal and illegal combined. Please do not relay my message to white house, will you?