By John Revill ZURICH (Reuters) – The Swiss National Bank sees the current increase in inflation as a temporary phenomenon, Chairman Thomas Jordan said on Tuesday, although the central bank would keep a close eye on the situation. Central banks including the U.S. Federal Reserve and the Bank of England have started raising interest rates to fight higher prices, although the SNB has so far not raised its policy rate, the world’s lowest at minus 0.75%. This has been despite Swiss prices rising by 2.4% in March, compared with a year earlier, its highest level in years as higher energy costs and s…