Due to obvious reason only the period after Bretton Woods counts.

So 55 years. 1980 and 2001 was almost half of that and the real price of gold declined by 4-5x. If you take out the spike in the late it’s still almost 2x or so compared to the 70s (very volatile period).

This wasn’t lag. M2 supply grew continuously and increased by >3x during he two decades while even the nominal price of gold declined.

After the gold standard was abandoned it became a highly speculative volatile asset.