You can see a little bit of a slowdown there in the mid-'70s, but it matches up pretty well with the Second Industrial Revolution, when factories were learning how to electrify their operations.
Ju mund te shikoni nje ngadalesim ne mesin e viteve 70-te, por ky perkon me Revolucionin e Dyte Industrial, kur fabrikat po mesonin si te elektrifikonin proceset e tyre.