depends on whether you count politicians as apocalypses.The frequency in which apocalypses occur seems to be growing, doesn't it? Y2K. The end of the Mayan calendar. Now this.
I was too young and/or not born yet to know, but were there this many apocalypses in the last century?
But only this week I read that Nessie is presumed to be dead as she wasn't seen in over 2 years.
As for Ragnarök: it's postponed. The Edda clearly says that before Ragnarök there'll be Fimbulwinter, a sort of small ice age, lasting 3 years. Thanks to global warming that might take a while.
Also, Ragnarök is not the end of the world. It's just the end of the gods and the beginning of a new era.