Here is the crude oil price chart from US department of energy
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We clearly see a trend that in 2018, oil prices have jumped from $40 in 2017 to about $63 by the time Imran got into office in 2018. After that the prices dropped briefly in 2019 and then completely crashed to as low as $15 in April 2020 (futures were negative at the time). The whole of 2020 has low fuel price - lower than 2016! This allowed Imran to shore up foreign reserves considerably. There seems to be a correlation with the rise and drop in foreign reserves for Pakistan.
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If this obvious correlation in two datasets does not appeal to your rational, then what is in your opinion the reason for drop in reserves? What evidence can you cite to support the claim? Imran's oil subsidy has the same effect on foreign reserves as burning $ to shore up PKR (as you often say).