If you click on a term, you’ll see the page it leads to. I’m assuming they manually assigned a page per line and then counted pageviews for each page.

oh i thought it was actual search term

It's the page for Elizabeth II

I wonder if when the song was written, the phrase was actually a reference to princess diana.

It's an oblique reference to the royal culture of the time, which was indeed pretty cult-like, but also - I believe he is referring to Elizabeth II's coronation as it was a fairly significant socio-political event in the Western world when it happened - the crux of the British Empire, one might say, and by referencing it, Joel made a pretty wry statement about the world powers ..