mintage vs shilling

mintage

noun
  • Coins collectively; specie 

  • The batch of coins minted at one time 

  • The fee paid to a mint 

  • The process of minting coins 

shilling

noun
  • A coin formerly used in the United Kingdom, Ireland, Malta, Australia, New Zealand and many other Commonwealth countries worth twelve old pence, or one twentieth of a pound sterling. 

  • A currency in the United States, differing in value between states. 

  • The currency of Kenya, Somalia, Tanzania and Uganda. 

  • The Spanish real, formerly having the value of one eighth of a dollar. 

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