Yes, darkspilver is right.
The money is for the Global Assistance Arrangement (GAA) which was started in 2015 and replaced the already existing Kingdom Hall Assistance Arrangement (KHAA).
The GAA coincided with the revised Kingdom Hall Fund (KHF) that was in operation for 30 years. That was the time when all Kingdom Hall Loans and mortgages were cancelled and congregations were asked to pool in resolved funds monthly towards this cause.That was also the time when the "Contributions for Kingdom Hall Construction Worldwide" box was removed.
The reason given for this was the bible text 2 Cor 8:14: but that by means of an equalizing, your surplus at the present time might offset their need, so that their surplus might also offset your deficiency, that there may be an equalizing. "