The last was H1N1 (swine flu) outbreak, which killed hundreds of thousands of people. It was declared a pandemic by the WHO in 2009.
And they got a right old bludgeoning because it triggered a number of costly 'delay' - as opposed to 'containment' processes in various countries which angered some people as unnecessary.
As I understand it WHO changed the definition of what a pandemic is in ~2009. So take comparisons to earlier pandemics with a grain of salt.