petty cash vs pork barrel

petty cash

noun
  • Cash available for trivial purchases, especially limited funds for employees to use without close supervision. 

pork barrel

noun
  • A ready supply of income; one's livelihood. 

  • State funds as assigned for local or regional expenditure; especially, central money used for regional projects which are eyecatching or designed to appeal to voters. 

How often have the words petty cash and pork barrel occurred in a corpus of books? (source: Google Ngram Viewer )