[1] https://en.wikipedia.org/wiki/Solar_power_in_Germany#Generat...
[2] https://wiki.energytransition.org/wiki/history-of-the-energi...
It's also interesting that we're talking about 1980/90. 25 years ago is 1999.
So starting maybe in the 1970s would produce the current performance and economies of scale, but much earlier, not "starting" in 1999.