backdated
increase backdated to December

confidence
to increase somebody's confidence

demand
a demand for a 5% pay increase

factor
to increase by a factor of three

fourfold
to increase fourfold

hundredfold
to increase a hundredfold

increase
to increase in price

price
price increase / price rise

proportional
...a proportional increase in the expense

salary
salary increase

sevenfold
to increase sevenfold

sixfold
to increase sixfold

steady
steady increase

tenfold
to increase tenfold