To what degree was the German Luftwaffe successful at repelling Allied bombing raids from 1943 - 45?

The German Luftwaffe was seriously depleted by its efforts
in the Battle of Britain in 1940-41 as well as during the war against the USSR on the
Eastern Front.  In addition, the Allies had an inexhaustible supply of resources and
bombers with which to attack Germany.  From 1943 on, bombing raids were happening both
day and night, and in larger concentrations of bombers.  The most the Luftwaffe could do
in those circumstances was to thin out the number of attackers and hope the losses
became steep enough that the attacks would slow or stop.  They very rarely broke up an
entire raid.

What's more, the technology of Allied
warplanes, both bombers and fighters, became more advanced as the war progressed.  By
late 1944, the P-51 Mustang (best fighter plane of the war) was in Europe in strength,
and had even been equipped with "buddy stores" of fuel so that they could escort the
bomber force all the way to their targets and back.

The
Luftwaffe, therefore, became less and less successful at protecting the Fatherland from
bombing raids as the war went on, and through a brutal process of attrition and loss in
addition to critical shortages of parts, pilots and fuel, by early 1945 it had ceased to
exist as an effective fighting force.