The following table gives the average prices per quarter of vegetables over 2 years. In which quarter was the difference in price maximum?
| price per kg (in โน) year 1 | price per kg (in โน) year 2 | |
| quarter 1 | 36 | 40 |
| quarter 2 | 80 | 80 |
| quarter 3 | 65 | 40 |
| quarter 4 | 43 | 40 |