The sentence "has been increasing ever" is grammatically correct and can be used in written English.
It can be used when discussing something that has been increasing on an ongoing basis, for example, "The sales of this product have been increasing ever since its launch".
The interest in asteroid missions for the scientific exploration and near-Earth object (NEO) hazard mitigation has been increasing ever since the last two decades.
"The principal has been increasing ever since he got the loan, and his payments will go from $1,100 a month to over $3,000," said Navid Vazire, a lawyer with the Foreclosure Prevention Project who is representing Mr. Jack.
It is also more strongly committed to what Margaret Thatcher once called "Victorian values"—individualism, voluntarism, patriotism.American exceptionalism has been increasing ever since the rise of the modern conservative movement from the late 1960s onwards.
The number of centenarians has been increasing ever since.
The article sparked a wave of research on ToM that has been increasing ever since.
The early 2000s witnessed the beginning of the generation of many pathway databases and their number has been increasing ever since, but has stabilized in the 2010s [ 2, 4].
They have been increasing ever since and are on track to exceed 80,000 retirements — about 5percentt of the workforce — by the end of the fiscal year, according to figures from the Office of Personnel Management.
Native people reached the nadir of [End Page 669] their population in the early twentieth century and have been increasing ever since.
At the end of World War II, these two ungulate species were almost extinct in the Italian Alps, but their ranges and population sizes have been increasing ever since [46].
The signs and symptoms had started 2 weeks before, and intensity had been increasing ever since.
