"The fastest economic growth in more than 30 years"
Does it mean that country experienced the fastest economic growth relative to any year within the 30 year period?
Yes, It's a very old article. i came across that sentence on ludwig. So i am kinda curious about this. If you find that article too tedious to read, you may opt to answer the second example.
"Gold is set for the biggest monthly gain in more than four years after a weaker dollar and low rates fueled its surge to a record."