now that i have a cat, i truly understand the the sentiment of mr wick

The science folks document attacks that succeed and those where the prey escapes (possibly wounded, but still not a meal). Here's a PDF on some hawk rates -- it is just a few pages from a larger work. Excerpt:

Relatively high successrates of 89 and 82% have been documented for
the fish-eating Osprey (Pundion haliuetus)in Europe (Brown and Amadon
1968) and North America (Ueoka and Koplin 1973). Success rates of 33-
65% have been reported for the insectivorous and rodent-eating American
Kestrel (F. spurverius),depending upon season, prey type, and geography
(Jenkins 1970, Sparrowe 1972, Rudolph 1982, Collopy and Koplin 1983).
Various success rates have been reported for raptors that feed mostly
upon mammals, but supplement their diets with birds and reptiles. Mader
(1975) documented a rate of 16% for Harris’ Hawks (Purubuteo unicinc-
tus). Wakeley (1978) reported that Ferruginous Hawks (Buteo regulis)
were successful 17% of the time in Idaho. Orde and Harrell(l977) reported
a successrate of 79% for Red-tailed Hawks (Buteojumuicensis) in South
Dakota. Nesting Golden Eagles (Aquilu chrysuetos)in Idaho were suc-
cessful on 20% of their capture attempts (Collopy 1983). Clark (1975)
calculated a success rate of about 20% for the rodent-specializing Short-
eared Owl (Asioflammeus).