What was the yearly number of MiG-15's produced?
There is hardly anything that can't be found with the help of a few friends and the Library of Congress. "Истребитель МИГ-15 (MiG-15 Fighter)" ISBN 9785857290194 Pp.52-57.

Plant No.1 (Kuibyshev):

             MiG-15    MiG-15bis    MiG-15Pbis     UTI MiG-15bis
1949 Plan    550       
     Actual  510
1950 Plan    300       350                          50
     Actual  301       401                          50
1951 Plan              792         5               365 
     Actual            820         5               371
1952 Plan              425                         315
     Actual            460                         333
1953 Plan              
     Actual    2                                   127


Non-flyable [what the heck is that??] MiG-15: 2 in 1949, 4 in 1950.
10 knock-down UTI MiG-15 kits were produced in 1951.

Plant No. 153 - Novosibirsk

             MiG-15    MiG-15bis    MiG-15Pbis     UTI MiG-15bis
1949 Plan    550       
     Actual  144
1950 Plan    300        500                         
     Actual  308        360                         
1951 Plan              1173                         
     Actual    1       1196                        
1952 Plan               840                         
     Actual             863                         
1953 Plan                                          200
     Actual               1                        209
1954 Plan                                          700
     Actual                                        715


Plant No.381 (Leningrad): 1949 - 75 MiG-15

Plant No.21 (Gor'ky):

             MiG-15bis (type 53)    MiG-15Rbis (type 55)
1950 Plan    350                                             
     Actual  367                                
1951 Plan    937                     60                         
     Actual  992                     64                        
1952 Plan    395                    300                         
     Actual  425                    300                         


Plant No.31 - Tbilisi

             MiG-15bis (art. 50)
1951 Plan     30                         
     Actual   35                        
1952 Plan    190                         
     Actual  190                         


Plant No.126 - Komsomo'ls'k-NA-Amure

             MiG-15                 MiG-15bis
1950 Plan                           250                         
     Actual    1                     42            
1951 Plan                           337                         
     Actual                         362                    
1952 Plan                           400                         
     Actual                         428                         


Plant No.292 - Saratov

             MiG-15    MiG-15bis    MiG-15Sbis
1950 Plan              275                                   
     Actual    8?      131                         
1951 Plan              457          100                           
     Actual            509           49                        
1952 Plan              350                                  
     Actual            354                                   


Plant No.135 - Kharkiv

                UTI MiG-15
1950 Plan              25                                   
     Actual             6                         
1951 Plan              50                                    
     Actual            50                                 
1952 Plan             150                                  
     Actual            85
1953 Plan             150
     Actual           158
1954 Plan             200
     Actual           212


Plant No.99 (Ulan-Ude)                                   

                UTI MiG-15
1951 Plan              75                                    
     Actual            29                                 
1952 Plan             125                                  
     Actual            53
1953 Plan             150
     Actual           127
1954 Plan             200
     Actual           206
1955 Plan             225
     Actual           245
1956 Plan              
     Actual           173
1957 Plan              
     Actual           113
1958 Plan              
     Actual           106
1959 Plan              
     Actual            65


Totals for the USSR (may contain errors, haven't double-checked):

|      | Combat MiG-15 and variants |  UTI MiG-15   |
| Year | Plan          | Actual     | Plan | Actual |
| 1949 | 1175          |  729       |    0 |    0   |
| 1950 | 2325          | 1911       |   75 |   56   |
| 1951 | 3891          | 4033       |  490 |  450   |
| 1952 | 2900          | 3020       |  590 |  471   |
| 1953 |    0          |    3       |  500 |  621   |
| 1954 |               |            | 1100 | 1133   |
| 1955 |               |            |  225 |  245   |
| 1956 |               |            |    0 |  173   |   
| 1957 |               |            |    0 |  113   |
| 1958 |               |            |    0 |  106   |
| 1959 |               |            |    0 |   65   |