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

### Instruction:
What is the lowest Natural Change, when Natural Change (Per 1000) is 19.1, and when Crude Birth Rate (Per 1000) is less than 28.3?

### Inputs:
table_name: table, columns: ['Average population (x 1000)', 'Live births', 'Deaths', 'Natural change', 'Crude birth rate (per 1000)', 'Crude death rate (per 1000)', 'Natural change (per 1000)']

### Response:
SELECT MIN Natural change FROM table WHERE Natural change (per 1000) = 19.1 AND Crude birth rate (per 1000) < 28.3