Words per decade

Hi guys! I've used statistical data to measure the relative distribution of different words over the last 13 decades.

In the table below, I measured all the words i could find that starts with 'air'. The stronger the green colour, the more frequently used was the word in that decade. Less than 100% means that the word was less frequently used than the average of all the 13 decades. More than 100% means that the words was more frequently used than the average of all the decades.




In the table below I did the same with some words that all start with 'the'.



And finally, here are some words starting with the letter y.