A table showing the percentage of UV rays blocked based on the SPF ratings of sunscreen. The data is as follows: SPF 2 rating blocks 50 percent of UV rays SPF 4 rating blocks 75 percent of UV rays SPF 10 rating blocks 90 percent of UV rays SPF 15 rating blocks 93 percent of UV rays SPF 30 rating blocks 97 percent of UV rays SPF 50 rating blocks 98 percent of UV rays SPF 100 rating blocks 99 percent of UV rays