  We present analysis of the rate of giant radio pulses (GPs) emission from the
Crab pulsar (B0531+21). Results of our 9 years daily observations with the
Large Phased Array radio telescope of Pushchino Radio Astronomy Observatory at
111 MHz were used. Limited sample of 8753 strong individual pulses in 2004
observational sessions was further analysed. It was shown that the observed
monthly averaged rate of GPs emission was highly unstable during the entire
span of observations and changes by about two orders of magnitude for
high-energy pulses. Data were further analysed to search for the possible
connection between pulsar glitches and the process of GP emission. We have
found a significant increase in the rate of emission of high-energy GPs after
MJD 58064, when the largest glitch ever observed in the Crab pulsar was
happened. Although considerable changes in GPs emission rate could have been
caused by the propagation effects in the nebula itself, we have found that the
pulsar had demonstrated high degree of intrinsic irregularity of high-energy
pulses emission over long time intervals.
