Answer: 4 years if you are talking about presidency.
This is true. The Ukiyo-e was a type of art creating that came form Japan and that impressionists were known for incorporating. The idea was called Japonism and was common in France who studied the Japanese arts extensively and found a way to incorporate their ideas in their art.
The question is asking to determine the year the the natural gas would last according to some estimate, base on my research and further investigation, the possible answer would be 92 year. I hope you are satisfied with my answer and feel free to ask for more if you have question and further clarification