According to Forbes (quoting the annual U.S. court system report for 2009) there were 2376 wiretaps in the U.S. set up by law enforcement agencies in the U.S. during 2009.

According to an article in dnevnik, quoting the 2009 report of the Sofia City Court, there were 3662 wiretaps in Sofia alone, and 5449 call records allowances were issued.

The following table summarizes clearly my point:

United States Sofia (Bulgaria)
Population 307 000 000 (July 09)[1] 1 500 000 (Jan 10)[2]
Wiretaps 2376 3662

According to my humble math capabilities in Sofia, in 2009, roughly 50% more people were wiretapped than in the entire United States, while Sofia has roughly 20 times less citizens than the United States has.

Cheers Big Brother!

Sources

[1] Google – public data

[2] Sofia – Wikipedia