there's a weird ambiguity when changes are expressed in percentages
if i say "the population increased by 100%", it's obvious that i mean that the population doubled, because it wouldn't be an increase if the population was 100% of what it was before
but i just heard a stat reported as "increased by 600%" and i don't know if the current number is 6 or 7 times what it was before
i guess it means 7 times, given my "100%" example, but that makes things hard to parse, a "600% increase" means "multiplied by 7"
all this to say, i really don't like percentages in news reports, it feels to me like they're trying to sound precise and/or dramatic, and it does nothing to help understand the actual report