Populations of large fish have dropped by 40% since 1950.
My understanding of this sentence is that 40 percent means the "total" dropped number of large fish counted from 1950 up untill now. I mean 40 percent is like the final count, not the annual average count.
Did i understand it correctly?
Thank you in advance
It means that if the population was 100 in 1950, it is 60 now.
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