Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name | Years | Gender | Area | Authority | Decile | Roll |
| --- | --- | --- | --- | --- | --- | --- |
| Arrowtown School | 1–8 | Coed | Arrowtown | State | 10.0 | 498.0 |
| Glenorchy School | 1–8 | Coed | Glenorchy | State | 9.0 | 28.0 |
| Hawea Flat School | 1–6 | Coed | Hawea Flat | State | 10.0 | 160.0 |
| Holy Family School | 1–8 | Coed | Wanaka | State integrated | 10.0 | 122.0 |
| KingsView School | 1–8 | Coed | Frankton | State integrated | 10.0 | 20.0 |
| Makarora Primary School | 1–8 | Coed | Makarora | State | 7.0 | 15.0 |
| Mount Aspiring College | 7–13 | Coed | Wanaka | State | 10.0 | 711.0 |
| Queenstown School | 1–6 | Coed | Queenstown | State | 10.0 | 627.0 |
| Remarkables Primary School | 1–8 | Coed | Frankton | State | 10.0 | 495.0 |
| St Joseph's School | 1–8 | Coed | Queenstown | State integrated | 10.0 | 141.0 |
| Wakatipu High School | 9–13 | Coed | Queenstown | State | 10.0 | 720.0 |
| Wanaka Primary School | 1–6 | Coed | Wanaka | State | 10.0 | 527.0 |
Question:
How many decile has a roll less than 20?
Answer:
7.0