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

### Instruction:
What is the total number of regions where the average family size is 2.8?

### Inputs:
table_name: table, columns: ['Region of USSR', 'Number of families', 'Number of people', 'Average family size', '% of total deportees']

### Response:
SELECT COUNT % of total deportees FROM table WHERE Average family size = 2.8