Bulgaria's gross external debt grew by 10.9% on the year to some 54.26 billion euro ($64.6 billion) at the end of November, from a revised 53.58 billion euro in October, the central bank said on Friday.Gross external debt at the end of November was equivalent to 47.3% of the gross domestic product (GDP) projected for the year, the Bulgarian National Bank (BNB) said in a monthly report. [....]