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:
| Source | Chrome | Internet Explorer | Firefox | Safari | Opera | Other |
| --- | --- | --- | --- | --- | --- | --- |
| StatCounter | 42.68% | 25.44% | 20.01% | 8.39% | 1.03% | 2.44% |
| Clicky | 38.92% | 29.08% | 21.22% | 9.28% | 1.17% | 0.32% |
| W3Counter | 32.60% | 21.70% | 19.50% | 15.40% | 2.20% | 8.60% |
| NetApplications | 16.00% | 57.60% | 18.88% | 5.59% | 1.53% | 0.41% |
| Wikimedia | 46.02% | 20.47% | 17.71% | 3.10% | 5.45% | 7.25% |
Question:
What percentage of users were using Firefox according to the source that reported 21.70% used Internet Explorer?
Answer:
19.50%