Ah. Wikipedia as the arbiter. That answers so many questions Michael....

Anyway.. Having written a song about it and sang it last night in a folk club, I can say that it is 800 and no lower figure, as 800 has the required three syllables for my verse, and anything subsequent won't last the passage of time in the same way a song does. A Martian Cecil Sharpe will collect my song in the future. He won't be unearthing an old copy of The Irish Times.

I still can't believe I heard a folk singer want to see what the nitty gritty facts are. So out of character.