a lot, but we also have a somewhat stable imports vs exports ratio when compared to Japan. if you're a massive net importer though like Japan is/was it can be a HUGE issue.
Just for the record: Japan was always a net exporter until 2011:
https://data.worldbank.org/indicator/BN.GSR.GNFS.CD?locations=JPThe initial round of QE by the BoJ, inspired by the theories of Richard Werner, took place from 2001-2006. So Japan's dependency on volatile energy and food imports was NOT the reason they began engaging in QE.
Regarding the petrodollar: it is the high degree of self-sufficiency of the US with regard to energy and food which causes it to have a rather stable import/export ratio. That, coupled with the size and diversity of its economy as well as its liquid financial markets, makes the US the prime candidate to anchor the world's reserve currency. The ability to protect its assets with the strongest military in the world is then the cherry on top. No other nation in the world is such a complete package.
Europe is fragmented, lacks military might and economic integration. China doesn't have open financial markets or business environments. All other countries are too small or too dependent on a particular industry.