The following table shows the number of cars of 6 different brands on the roads during a given year.
| Brand | Cars |
| B1 | 2000 |
| B2 | 2200 |
| B3 | 2700 |
| B4 | 1800 |
| B5 | 1300 |
| B6 | 3000 |
The cars of brand B2 are what percentage of the number of cars of all the 6 given brands taken together? [Give your answer correct to 2 decimal places.]