This is exactly what I thought.

I've been working for more than 9 years. Interviewed with at least 10 companies. This is the first one ask for this. I feel this is abnormal. Since I am underpaid, I don't want company to take advantage of this. I read this forum and know that if you asked much more above your current pay, you are in a disadvantage position. The company will think you open a big mouth.

BTW, this company is at southern CA. Thanks!