Corruption has come down in Delhi by 70-80%, Chief Minister Arvind Kejriwal said on Sunday, adding his party will try to fulfil its election promises within four years.Addressing thousands of auto-rickshaw drivers here, the Aam Aadmi Party (AAP) leader also announced the launch of a helpline (011-4240 0400) where people could lodge complaints against autos.He said commuters in general were upset with auto-rickshaw drivers because they often refuse to take passengers, don't put on the meters and misbehave with people.At the same time, the chief minister, who has always considered auto-rickshaw drivers amongst his solid supporters, announced sops for them.He said the power to prosecute drivers not wearing their uniform was now being taken away from the Delhi Traffic Police and given to the Delhi government's transport department.He also also said that henceforth, auto-rickshaw drivers while driving home could put up the board of their destination so that they were not forced to go to other places.The drivers, he said, would no more have to produce their Class 8 school certificate each time they renew their driving licence."All of you should be honest and serve the people of Delhi, and we will take good care of you," he said.With IANS