In contrast, the state governments managed to dispose of just 15% complaints, the Department of Personnel and Training said in its annual report for 2016-17.
The report said that the Centre received a record 11.92 lakh complaints against its departments in 2016 while another 2.86 lakh grievances pertaining to state governments were sent to the states for redressal.
Officials attributed the spike in the number of complaints subsequently to faster disposal by the Modi government and its efforts to enhance awareness among citizens in this regard.
"We do not mind the increasing number of grievances. It only shows the faith among the citizens in the Modi government that a complaint if made will be resolved. We have shown our resolve by solving 99% of the complaints we got last year," a senior government official told ET on condition of anonymity.
The Centre disposed of 11.82 lakh complaints in 2016-17, with the four departments topping the charts including the telecom department, financial services (banking division), railways and the human resource development ministry.