1992 amendment was proposed in the 1700s, you have to go back more than 50 years to get to the next amendment.
> Do you have some list of developed nations rate of constitution updates?
Yes. https://comparativeconstitutionsproject.org/chronology/#
> Do you have some list of developed nations rate of constitution updates?
Yes. https://comparativeconstitutionsproject.org/chronology/#
Picking only a high level misses that there are higher levels (such as world treaties and laws we are entered into) and ignores that the US is a conglomeration. When you'd pick Germany, but ignore EU rules, it's somewhat like picking Texas, and ignoring US.
It seems you're not really comparing frameworks very well.