I have extracted Short-eared owl counts for CBC's from
1969 to 1999 just to see what they look like at:

http://home.pacifier.com/~mpatters/cbc/seow.html

Short-eared Owl counts were quite high in the early
to mid 70's then dropped to a fairly regular low value.

--
Mike Patterson Alas, to wear the mantle of Galileo,
Astoria, OR it is not enough to be persecuted
celata at pacifier.com by an unkind establishment,
you must also be right.
---Robert Park
http://www.pacifier.com/~mpatters/bird/bird.html