For many years, the only number it wanted to talk about was, well, No 5. Privately held Chanel has reported that it finished up 2017 just shy of $10 billion in sales. The announcement marked the first time in 108 years that the luxury goods company, which has always kept that information close to the vest, had officially released performance numbers.   Revenue rose 11.5% to $9.62 billion in 2017, according to the company. Some media reports suggested the company released the earnings in...