LONDON—Not long ago, the oil sector was a powerhouse in the British blue-chip index. Nearly 24% of the total market value represented in the FTSE 100 in 2009 comprised oil drillers or oil-service companies.
In 2016, the percentage is down to 12%. Only two oil companies are in the FTSE 100—BP PLC and Royal Dutch Shell PLC—down from eight in 2012, when it was the biggest sector on the index.
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