The following table shows the amount (in quintals) of 6 different types of sweets sold by a shop during a given year.
| Sweet | Amount |
| S1 | 32 |
| S2 | 48 |
| S3 | 23 |
| S4 | 37 |
| S5 | 39 |
| S6 | 21 |
The amount of S1 sold in that year was what percentage of the average amount of sweets sold per type during that year?