TABLE B-52. Long-term trend in pond indexes by strata and comparisons to 
average and previous year, southern Manitoba, May and July, 1965. 
[Indexes in thousands] 
Year 
Stratum 
Total 
A 
B 
A and B 
May: 
1954 . 
258 
428 
686 
1955 .-. 
315 
428 
743 
1956 -.-. 
391 
615 
1, 006 
666 
1957 .-.-.- 
262 
404 
1958 .-.- 
352 
264 
616 
1959 .. 
160 
482 
642 
1960 . 
324 
295 
619 
1961. 
158 
263 
421 
1962 -. 
135 
295 
430 
1963 . 
298 
331 
629 
1964 . 
398 
331 
729 
1965 . 
327 
478 
805 
Average 1954 through 1964- 
277 
376 
653 
Percent change: 
1965 from 1964 - 
-18 
+44 
+10 
1965 from 1954-1964 average- 
+18 
+27 
+23 
July: 
1954 .-. 
473 
384 
857 
1955 . 
339 
271 
610 
1956 . 
425 
411 
836 
1957 . 
241 
260 
501 
1958 ..-. 
163 
341 
504 
1959 . 
96 
325 
420 
1960 . 
164 
212 
376 
1961. 
41 
86 
129 
1962 . 
97 
135 
232 
1963 . 
145 
178 
323 
1964 . 
201 
182 
383 
1965 .-.— 
129 
260 
389 
Average 1954 through 1964- 
217 
253 
470 
Percent change: 
1965 from 1964 . 
-36 
+43 
+02 
1965 from 1954-1964 average- 
-41 
+03 
-17 
79 
