The sunset clause in year 2002. Read the complete clause for your info -
Sunset Clause: If at the renewal falling due any time between 1st July 2002 and 30th June 2003, both days inclusive, (after completion of the full policy period of 12 months) an insured becomes entitled to an NCB of 55% or 65% in terms of the Tariff prevailing prior to 1st July 2002, the entitlement of such higher percentage of NCB will remain protected for all subsequent renewals till a claim arises under the policy, in which case the NCB will revert to 'Nil' at the next renewal.

The percentage of applicable NCB is to be computed on the Own Damage premium required for renewal of the insurance after deducting any rebate in respect of "Vehicle Laid Up" under the policy.