How often should I go for a pap smear test?

Dear Doctor, I heard of pap smear tests when I was about 20 years old and was afraid to go thinking it is painful. However, a friend convinced me and we went together, and I’ve had a pap test every year for 10 years, since I was about 25. It’s always normal. Do I still need one every year or is it not necessary? How often should I go now?
no image
Dr. Rachna Pande