Daily UFO Histogram 1965-1969
The mid to late 1960s were a series of waves, spread over at least three continents.From small numbers in the early 1960s, we jump to 393 listings in 1965, 492 in 1966, 837 in 1967, 536 in 1968 and 320 in 1969 as the counts fall off again.
The biggest years in North America were 1967 with 547 listings, mainly in February - March .. following some 362 in 1966. Europe has 188 listings for 1968, spread over the last half of that year. South America registers 136 events in 1968, with a peak in July.
More than sheer numbers, it is the global years-long series of flaps and increasing strangeness of reports that draws attention.