Yeh same here. Typically graph x-axis are time, totally threw me off.

So seeing that in reverse I was like "Well because we have more family and less Rated R movies nowadays that are blockbusters". Even rated R movies are not the same as the top grossing one is 'Passion of the Christ'.

Not sure what is worse graphs with time in the wrong direction or that more family movies are being made now with killing in them.