There was a more recent study about insects in Europe confirming your assumption. https://www.pri.org/stories/2017-11-14/global-population-flying-insects-crashi

There was a more recent study about insects in Europe confirming your assumption. https://www.pri.org/stories/2017-11-14/global-population-flying-insects-crashing-dangerously-fast https://www.pri.org/stories/2017-11-14/global-population-fly...