Combat sorties flown in the ETO,
http://www.usaaf.net/digest/t119.htm
1943
Jun - 2,107 - 1,268 (airborne - effective)
Jul - 2,829 - 1,743
Aug - 2,265 - 1,850
Sep - 3,259 - 2,457
Oct - 2,831 - 2,117
Nov - 4,157 - 2,581
Dec - 5,973 - 4,937
1944
Jan - 6,367 - 5,027
Feb - 9,884 - 7,512
As can be seen there was a dip in Oct '43 but there was a steady increase in the number of sorties flown.