Original sentence: James Nason, the Head of International Communications for Swiss Banking Association, suggests "Anyone claiming to have such figures (for India) should be forced to identify their source and explain the methodology used to produce them.The Indian economy has an underground economy, with a 2006 report alleging the Swiss Banking Association suggesting that India topped the worldwide list for black money with almost $1,456 billion stashed in Swiss banks.These allegations have been denied by Swiss Banking Association
Edited sentence: The Indian economy continues to face the problem of an underground economy with a 2006 estimate by the Swiss Banking Association suggesting that India topped the worldwide list for black money with almost $1,456 billion stashed in Swiss banks