"likely increased" is a correct and usable phrase in written English.
It is typically used when you believe something has increased, but you aren't certain. For example, "The number of people attending the event likely increased after the promotional flyer went out."
Some experts say the number has likely increased since then.
I had discovered a SNP that likely increased my life span.
Calving quite likely increased even more so during the extreme high tides of early January 1912.
By 2011, the latest year for which estimates are available, that figure had grown to $946.7bn, and has likely increased since then.
She's dealt Palmer a politically mortal blow, changed the dynamics of the Senate, and likely increased the exposure of our polity to the dark whims of base populism.
It is, he wrote, "no longer possible, scientifically or politically, to deny that human activities have very likely increased global temperatures; what remains in dispute is the precise magnitude of the human impact".
The bank said: Inflation pressures remain in the UK and, while there has been no interest rate hike yet, the probability of one in the next few months has likely increased.
In the months since the film was completed, that number has most likely increased greatly, and the fate of the Afghans who have fled 20 years of war and deprivation has become suddenly and unexpectedly relevant to American movie audiences.
Higher prices for prepared foods will offset likely increased costs for grain and other materials, while domestic availability of chicken will depend on export volumes.
Figures for the past two years, which are not yet available, have most likely increased the gap significantly, county health officials said.
The turnout in Alabama was most likely increased because the three leading candidates campaigned aggressively in the state, whereas in 2008 Alabama was ignored.
