The price of oil is, on December 19, 20% below its 2018 average. The contribution of energy to the inflation rate will quickly be negative. Inflation will fall below 1% in the euro zone in 2019. (The energy price is the main source of fluctuations of the inflation rate. Sometimes on the upside sometimes on the downside. Currently it’s on the downside)
For a zero contribution to inflation, on average over 2019, the price of oil should increase by 25% It is only above this 25% increase, on average in 2019, that inflation will go above underlying inflation (close to 1%). No rush for the ECB to change its mind on monetary policy