ballot box vs picking

ballot box

noun
  • The process or method of voting. 

  • A sealed box with a slit, into which a voter puts a completed voting slip. 

picking

noun
  • The act of making a choice; selection. 

  • Income or other gains, especially if obtained in an unscrupulous or objectionable manner. 

  • Something picked or pulled out. 

  • Items remaining after others have selected the best; scraps, as of food. 

  • The final finishing of woven fabrics by removing burs, etc. 

  • The removal of defects from electrotype plates. 

  • A gathering to pick fruit. 

  • Dabbing in stoneworking. 

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