Which preposition to use with additional

to Occurrences 13%

All these matters were additional to the important work upon which the Trade Division was constantly employed, which included all blockade questions, the routeing of merchant ships, examination of ships, etc.

of Occurrences 3%

An additional of two and one-half per cent, a new and temporary duty, called subvencion, appropiated to the payment of the loan made to the king by the Cadiz Board of Trade, and leviable on all kinds of imported goods, and, of course, equal, according to the usual mode of valuation, to about three per cent.

for Occurrences 1%

additional for care of the rooms.

in Occurrences 1%

The land warrants were issued at the rate of a hundred acres on each share of stock and a similar amount to each colonist of the time, to be followed in either case by the grant of a second hundred acres upon proof that the first had been improved; and fifty acres additional in reward for the future importation of every laborer.

Which preposition to use with  additional