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

### Instruction:
What was the population density in km2 for 2011 in the division where area in km2 was 684.37 in 2011?

### Inputs:
table_name: table, columns: ['Administrative division', 'Area (km²) 2011**', 'Population 2001 Census (Adjusted)', 'Population 2011 Census (Adjusted)', 'Population density (/km² 2011)']

### Response:
SELECT Population density (/km² 2011) FROM table WHERE Area (km²) 2011** = 684.37