routinely vs usually

routinely

adv
  • In a routine manner, in a way that has become common or expected. 

  • Done by rote or habit, as part of a routine, without attention or concern. 

usually

adv
  • Most of the time; less than always, but more than occasionally. 

  • Under normal conditions. 

How often have the words routinely and usually occurred in a corpus of books? (source: Google Ngram Viewer )