TABLE D-7.--Number of water areas, South Dakota, 1950-61 
[Index mmbers] 


1961: 
Stratum leo-----s-n---ec ere nner nen =n 
Stratum 2o--- 9-222 -n renew a eens can 
SrA eitin fo) Seo ere a ei ie 
AV@Tage—--- <2 nnn nen nnn ree nnn nnn crenn= aie 
127,900 



274, 800 
309, 400 
168, 300 
306, 500 
229,100 


-45 
-27 
2.39 
244 
2.05 
2.29 
4.16 
3.11 
Number per square mile 
TABLE D-8.-~-Number of water areas, by stratum, southern Manitoba, May and July, 1951-61 
[Index numbers, in thousands] 
Stratum A ; Stratum B 
Average, 1951-60~--------------<+--------= 
Percent change, 1961 from-- 
Average, 1954-60-------------+------------ 
Percent change,1961 from-- 
1960------------ fee ee een en en een ene nnn 
Average --------~ --- 20 - ee oo enn 

-85 -72 
79 
-78 
