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

### Instruction:
What is the national rank of Windstream?

### Inputs:
table_name: table, columns: ['State Rank by Revenue', 'Company Name', 'National Rank', 'Revenue ($billions) 2012 estimate', 'Headquarters City', 'Known for']

### Response:
SELECT MIN National Rank FROM table WHERE Company Name = Windstream