LGBT vs heterosexual

LGBT

adj
  • Being lesbian, gay, bisexual, or transgender, or relating to these groups as a collective. 

noun
  • A member of the LGBT community. 

heterosexual

adj
  • Sexually attracted to members of the opposite sex. 

noun
  • A heterosexual person, or other heterosexual organism. 

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