Add punctuation to the following sentence: Major petroleum discoveries were made in the 1960s and the TenYear Plan called for investing 60 billion in ten new oil and gas fields China relies very heavily on coal for energy and the TenYear Plan called for doubling coal production to 900 million tons per year through the creation of eight new mines China at the time of the formulation of the TenYear Plan was relatively weak in the use of electrical power
Major petroleum discoveries were made in the 1960s and the Ten-Year Plan called for investing $60 billion in ten new oil and gas fields. China relies very heavily on coal for energy and the Ten-Year Plan called for doubling coal production to 900 million tons per year through the creation of eight new mines. China at the time of the formulation of the Ten-Year Plan was relatively weak in the use of electrical power.