Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How many different voivodenship have 747 900 citizes?

### Inputs:
table_name: table, columns: ['Abbreviation', 'Voivodeship', 'Capital', 'Area km² (1998)', 'Population (1980)', 'No. of cities', 'No. of communes']

### Response:
SELECT COUNT Voivodeship FROM table WHERE Population (1980) = 747 900