Among pregnant individuals who are exposed to folate supplements, there are 24 cases of neural tube defect per 100,000 pregnancies. Among pregnant individuals who are not taking folate supplements, the number jumps to 631 cases per 100,000 pregnancies. Treat those who are not taking supplements as the 'exposed' group. Now calculate the risk proportion (i.e. percent) of neural tube defects attributable to NOT taking folate supplements among the exposed. Round to 2 digits after the decimal point