Amazon SES: Delivery vs SentLast24Hours? -

i have been using api total emails i've sent in last 24 hours.

public static double aws_quota_sentlast24hours()         {             using (var client = awsclientfactory.createamazonsimpleemailserviceclient(allsettings.default.awsaccesskey,allsettings.default.awssecretkey ))             {                 var sendquotaresults = client.getsendquota();                 return sendquotaresults.getsendquotaresult.sentlast24hours;              }         } 

actually i've sent 50 emails. can confirmed delivery report in amazon ses console:

is delivery value available via api? why isn't sent value accurate? know takes while update, i've waited full 20 minutes?

thanks in advance....