Size at birth | Type of fuel | Total (%) | |
---|---|---|---|
 | High pollution | Low Pollution |  |
Very large | 1181(3.44) | 590 (4.62) | 1771 (3.76) |
Larger than average | 6280 (18.27) | 2676 (20.95) | 8956 (19.0) |
Average | 19270 (56.07) | 7492 (58.65) | 26762 (56.77) |
Smaller than average | 5288 (15.38) | 1466 (11.47) | 6754 (14.33) |
Very small | 2346 (6.82) | 550 (4.30) | 2896 (6.14) |
Total | 34365 (100) | 12774 (100) | 47139 (100) |