For the first time in almost a year, mortgage rates are above 4%. While still low by historic standards — the annual average rate on a 30-year mortgage in 1981 was 16.63%, according to Freddie Mac — most observers expect rates to keep climbing in 2017. The increase, which is likely to be slow and steady for most of the year, will be driven by fiscal stimulus resulting from President Donald Trump’s policies, higher official rates as the Federal Reserve boosts the cost of borrowing in the face of faster economic growth, and rising bond market yields, experts say. Market rates spiked after Trump won the election, surprising many observers and forcing a rethink of expectations for the economy and markets.[…]