Coal production in China hit an all-time high last year despite a decline in coal-fired generation. At an annual 1.2%, the increase translated into a total of 4.83 billion tons, Bloomberg reported today, citing official statistical data. The annual increase in coal output came despite efforts by the government to curb oversupply that affected production during the second quarter of the year. Natural gas production also hit an all-time high as it continued an upward curve spanning three decades, and crude oil production also surged. Interestingly,…