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

### Instruction:
When buffalo narrows is the name how many measurements of population density per kilometer squared are there?

### Inputs:
table_name: table, columns: ['Name', 'Population (2011)', 'Population (2006)', 'Change (%)', 'Land area (km²)', 'Population density (per km²)']

### Response:
SELECT COUNT Population density (per km²) FROM table WHERE Name = Buffalo Narrows