Bulgaria's M3, the broadest gauge of money supply, increased 8.8% year-on-year to 93.3 billion levs ($54.1 billion/47.7 billion euro) at the end of 2018, compared to an annual growth of 9.3% at the end of November, the central bank, BNB, said.The narrowest measure of money supply, M1, rose 12.2% on the year to 53.6 billion levs at the end of December, compared to a 14.5% annual rise at the end of November, BNB said in a statement on Thursday.Net foreign assets increased 8.4% year-on-year at end-2018, reaching 56.1 billion levs. Net domestic assets added 7.8%, to 57.9 billion levs.