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STATEMENTS OF UNALLOCATED RESERVE AND TRUST CORPUS (Equity) - USD ($)
Unallocated Reserve
Trust Corpus
Total
Beginning Balance at Jan. 31, 2016 $ 9,009,911 $ 3  
Units, Beginning Balance at Jan. 31, 2016 13,120,010    
Increase (Decrease) in Unallocated Reserve and Trust Corpus      
Net income $ 9,763,771   $ 9,763,771
First quarter's distribution paid (2,624,002)    
Second quarter's distribution paid (2,624,002)    
Third quarter's distribution paid (1,312,001)    
Fourth quarter's distribution declared/paid (1,836,801)    
Ending Balance at Jan. 31, 2017 $ 10,376,876 3  
Units, Ending Balance at Jan. 31, 2017 13,120,010    
Increase (Decrease) in Unallocated Reserve and Trust Corpus      
Net income $ 33,423,425   $ 33,423,425
First quarter's distribution paid (7,216,006)    
Second quarter's distribution paid (2,099,202)    
Third quarter's distribution paid (8,396,806)    
Fourth quarter's distribution declared/paid (15,481,612)    
Ending Balance at Jan. 31, 2018 $ 10,606,675 3  
Units, Ending Balance at Jan. 31, 2018 13,120,010   13,120,010
Increase (Decrease) in Unallocated Reserve and Trust Corpus      
Net income $ 45,559,044   $ 45,559,044
First quarter's distribution paid (5,904,005)    
Second quarter's distribution paid (2,886,402)    
Third quarter's distribution paid (12,332,809)    
Fourth quarter's distribution declared/paid (18,236,814)    
Ending Balance at Jan. 31, 2019 $ 16,805,689 $ 3  
Units, Ending Balance at Jan. 31, 2019 13,120,010   13,120,010