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:
| Region | Physician (GP & specialist) | Physician : Population Ratio | Health Officer | HO : Population Ratio | All Nurses | Nurse : Population Ratio | Mid-wives | Mid Wife: Population Ratio | HEW* |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Tigray | 101.0 | 1:44,880 | 188.0 | 1:24,111 | 2332.0 | 1:1,944 | 185 | 1:24,502 | 1,433 |
| Afar | 15.0 | 1:98,258 | 29.0 | 1:50,823 | 185.0 | 1:7,967 | − | − | 572 |
| Amhara | 304.0 | 1:58,567 | 434.0 | 1:41,024 | 3790.0 | 1:4,698 | 212 | 1:83,983 | 7,471 |
| Oromia | 378.0 | 1:76,075 | 448.0 | 1:64,189 | 5040.0 | 1:5,706 | 287 | 1:100,197 | 13856 |
| Somalia | 71.0 | 1:65,817 | 12.0 | 1:389,415 | 314.0 | 1:14,882 | 45 | 1:103,844 | 1,427 |
| Ben-Gumuz | 12.0 | 1:59,309 | 42.0 | 1:16,945 | 452.0 | 1:1,575 | 37 | 1:19,235 | 499 |
| SNNPR | 242.0 | 1:65,817 | 220.0 | 1:72,398 | 3980.0 | 1:4,002 | 316 | 1:50,404 | 7,915 |
| Gambella | 13.0 | 1:25,585 | 13.0 | 1:25,585 | 91.0 | 1:3,655 | 4 | 1:83,150 | 457 |
| Harari | 29.0 | 1:6,655 | 31.0 | 1:6,226 | 276.0 | 1:699 | 29 | 1:6,655 | 47 |
| Addis Ababa | 934.0 | 1:3,056 | 170.0 | 1:16,791 | 3377.0 | 1:845 | 244 | 1:11,699 | NA |
| Diredawa | 53.0 | 1:6,796 | 19.0 | 1:18,957 | 272.0 | 1:1,324 | 20 | 1:18,009 | 142 |
Question:
What is the number of physicians in the region with an all nurses number of 91?
Answer:
13.0