on the increase
Increasing or growing steadily or rapidly. Infection rates are on the increase in the area due to inadequate access to clean water. Demand for the unusual cheese has been on the increase ever since it was featured on a popular cooking show.
on the increase
Growing, especially in frequency of occurrence, as in Violent crime is on the increase. [Mid-1700s]
on the increase
Increasing, especially in frequency of occurrence: Crime is on the increase.