[s1artibartfast]

The 1 in 3,500,000 rate is for years 1975 to 2015 and includes the 9/11 attack. Since 2001, the rate is about 6 deaths per year for a total of 100 over 17 years. This gives a post 2001 rate of less than one in 50 million.

See page 4 of the previously referenced document.

[tomp]

Ah, so you're likely using the annual rate. Parent was using lifetime risk.

[s1artibartfast]

Very good point, I missed that