How to get the original number using a percentage decrease?

I have statistics for some coursework, and for one year there is 700,000 road accidents, and this was a result of 39% decrease from another previous year, and I don't know how to find the original number, I did get a number which was around 1,800,000 (just under) but I don't believe this is... show more I have statistics for some coursework, and for one year there is 700,000 road accidents, and this was a result of 39% decrease from another previous year, and I don't know how to find the original number, I did get a number which was around 1,800,000 (just under) but I don't believe this is correct...

Any help would be appreciated!
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