Average attendance vs local population

1
Bath Rugby
Bath Rugby
city: Bath
population: 88,859
avg attendance: 11,806
13.29%
2
Gloucester Rugby
Gloucester Rugby
city: Gloucester
population: 128,500
avg attendance: 13,594
10.58%
3
Worcester Warriors
Worcester Warriors
city: Worcester
population: 101,328
avg attendance: 10,205
10.07%
4
London Irish
London Irish
city: Readin
population: 162,700
avg attendance: 11,820
7.27%
5
Exeter Chiefs
Exeter Chiefs
city: Exeter
population: 129,800
avg attendance: 8,322
6.41%
6
Leicester Tigers
Leicester Tigers
city: Leicester
population: 329,839
avg attendance: 20,661
6.26%
7
Northampton Saints
Northampton Saints
city: Northampton
population: 225,500
avg attendance: 13,241
5.87%
8
Sale Sharks
Sale Sharks
city: Salford
population: 248,700
avg attendance: 7,900
3.18%
9
Wasps
Wasps
city: Coventry
population: 352,900
avg attendance: 6,745
1.91%
10
Newcastle Red Bulls
Newcastle Red Bulls
city: Newcastle
population: 296,500
avg attendance: 5,311
1.79%
11
Harlequins
Harlequins
city: London
population: 8,787,892
avg attendance: 23,222
0.26%
12
Saracens
Saracens
city: London
population: 8,787,892
avg attendance: 15,324
0.17%
How is this data calculated? Averages are calculated from match attendances figures sourced from the official web wite for all home games played by respective teams during the 2011-2012 English Premiership season.