TABLE B-5. —Long-term trend in pond indexes by strata and 
with averages and the previous year, May and July, 
southern Alberta, 1965 
[Index numbers in thousands] 
Stratum 
A 
B 
C 
Total 
May: 
1952. 
402 
566 
135 
1103 
1953.. 
369 
539 
144 
1052 
1954-- 
434 
607 
122 
1163 
1955..— 
405 
656 
191 
1252 
1.956-- 
353 
598 
116 
1067 
1957.. 
187 
442 
82 
711 
1958- 
255 
431 
120 
806 
1959--- 
131 
253 
120 
504 
1960-- 
257 
550 
193 
1000 
1961-- 
191 
432 
69 
692 
1962.. 
118 
345 
60 
523 
1963..- 
170 
602 
72 
844 
1964-.— 
138 
366 
137 
641 
1965-- 
266 
637 
125 
1029 
Average 1952 to 1965 
percent change 1965 
from— 
Average- 
+1 
+27 
+4 
+16 
1964- 
+94 
+74 
-9 
+60 
July: 
1952-.. 
308 
396 
114 
818 
1953.. 
408 
363 
150 
921 
1954.. 
241 
400 
65 
706 
1955-- 
218 
339 
66 
623 
1956.— 
185 
420 
64 
669 
1957--- 
120 
288 
42 
450 
1958- 
136 
282 
53 
471 
1959—-.. 
93 
140 
74 
307 
1960-- 
84 
262 
57 
403 
1961 —--- 
51 
153 
35 
239 
1962.—. 
65 
257 
48 
360 
1963.. 
145 
471 
73 
689 
1964- 
78 
162 
72 
312 
1965-- 
233 
485 
135 
853 
Average 1952 to 1965 
percent change 1965 
from— 
Average- 
+38 
+54 
+80 
+52 
1964 —. 
+199 
+ 199 
+87 
+173 
43 
