I ran across this the other day — in 1859, there were 278 Orthodox bishops in the world:
| Church | Bishops |
| Constantinople (including Romania, Bulgaria, and part of Serbia) | 136 |
| Russia (including Georgia) | 65 |
| Greece | 24 |
| Antioch | 17 |
| Jerusalem | 14 |
| Austria (now Serbia, mostly) | 11 |
| Alexandria | 5 |
| Cyprus | 4 |
| Mount Sinai | 1 |
| Montenegro | 1 |
| TOTAL | 278 |
Source: J.M. Neale, trans., Voices from the East: Documents on the Present State and Working of the Oriental Church (London: Joseph Masters, 1859). Google Books has the whole thing available for free. If you go there and find those numbers, they’ll look a bit different, because I added in the four patriarchs at the time (Constantinople, Alexandria, Antioch, and Jerusalem).
You can find their names here:
http://books.google.com/books?id=pWgQAAAAIAAJ&pg=PA131#v=onepage&q&f=false
Looking at the numbers of Alexandria, I’m wondering if they are counting vacant sees. When Pope Photios, for instance, half a century asserted the independence of the Church against the Phanar, he solved the problem of not having enough bishops, i.e. <3, to consecrate successors-and therefore depend on the Phanar to supply them-by filling sees, and then forbidding the Phanar's representative from setting foot in Egypt (then independent from the Porte in all but name, and a British Protectorate).
On what basis are Ukrainian bishops added to the Russian church?
The Ukrainian Orthodox Church is an autonomous church under the Moscow Patriarchate. It received autonomy in the early 1990s.