In a cohort study investigating contraception and high blood pressure, a woman is considered to be "exposed" if she ever used or is using a hormonal contraceptive. In a sample of 4540 women who have not ever used a hormonal contraceptive, 65 developed high blood pressure. Of the 1628 women who have ever used a hormonal contraceptive, 31 were diagnosed with high blood pressure.

What is the attributable risk of high blood pressure in those who ever used hormonal contraception?

Estimate the attributable risk percent of high blood pressure in those who ever used hormonal contraception.