How frequent have coral bleaching events become due to rising sea temperatures?

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Coral bleaching events became more frequent, but no specific frequency figures are provided.
By IYOR 2008, global warming showed no signs of slowing down, and coral bleaching events were described as becoming more frequent. The material does not provide a measured rate such as “per year” or “per decade,” so the change is stated qualitatively rather than with a numeric frequency.
IYOR 2008 linked warming to more frequent bleaching
The timeline states that by 2008, global warming did not show any slowing trend. It then connects that ongoing warming to an increase in the frequency of coral bleaching events, without giving counts or time-based statistics for how often bleaching occurred after 2008.
A 2008 impact snapshot used reef loss percentages, not event frequency
The same 2008 point includes figures from the Global Coral Reef Monitoring Network: as much as 19 per cent of coral reefs were described as “effectively lost,” and another 15 per cent in a “critical state.” These figures quantify reef condition in 2008, but they do not translate into a numerical frequency of bleaching events.
Earlier bleaching in 1997 is described as simultaneous worldwide
The material also recalls that in 1997, coral reefs worldwide bleached simultaneously. It attributes that event to rising sea temperatures from global warming together with the El Nino effect, again without presenting a multi-year frequency table for later periods.
The broader context notes intensifying heat and major bleaching impacts
It adds context that since 2008, global warming, ocean acidification, and coastal pollution have intensified, and that 2016 was the warmest year ever recorded, followed closely by 2017, 2015, and 2014. It also cites that two thirds of the Great Barrier Reef was severely bleached “last year,” but this still does not provide a general “how frequent” metric for bleaching events.

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How frequent have coral bleaching events become due to rising sea temperatures?

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