Frankfurt--Jan. 16--German wholesale prices were down 0.3% on the month in December, as prices for cattle and oil products fell, and were up 5.1% on the year, the Federal Statistics Office said. In the year 2000, wholesale prices were on average 5.5% higher than the previous year. Annual increases in wholesale prices were under heavy influence from high oil prices, as the index excluding oil products was on average 2.5% higher in 2000 from 1999.