Where's the data coming from? This is interesting as a sort of bookstore web-storefront, but the numbers look funny to me. Catcher in the Rye readers are 75%

Where's the data coming from? This is interesting as a sort of bookstore web-storefront, but the numbers look funny to me. Catcher in the Rye readers are 75% male? Poor Little Bitch Girl (by Jackie Collins) readers are 100% male?