Graphing Spanking and Paddling references in Google’s massive digital library, shows that the references to paddling have been declining since the turn of 20th century. Spanking references have been on a steady up trend since the 1600’s.
See for yourself.
Of course, when you consider that paddling also includes paddling boats and mechanical energy largely replaced muscle power, the decline makes more sense.
Heck, now we have paddling machines. Thank goodness, my elementary school principal only tried to scare me by telling me about her spanking machine. Now, it could be true.