The November 2001 top500 supercomputer had 7.2 TFL0PS: https://www.top500.org/lists/top500/2001/11/
It's fun to compare it with the historical top500 list: https://www.top500.org/statistics/perfdevel/
It's fun to compare it with the historical top500 list: https://www.top500.org/statistics/perfdevel/