fix dates in patent introduction?

[za158]

@jmelot Can you confirm that the interval for this data is in fact those 10 years? as opposed to the interval we're using for growth calculations, which ends in 2020

[jmelot]

Yes, that's correct. I didn't think there was a reason to exclude the incomplete years from the total, although I suppose we might worry that some companies might have less incomplete data than others due to their source or country. What do you think?

[za158]

It's fine, just confirming my understanding