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

### Instruction:
What were the investment earnings in a year when total revenue was $21,779,618?

### Inputs:
table_name: table, columns: ['Year', 'Property Taxes', 'Investment Earnings', 'Other Local Sources', 'State & Federal', 'Total Revenue']

### Response:
SELECT Investment Earnings FROM table WHERE Total Revenue = 21,779,618