Extra credit for class regarding the NYSE: would my answer be accurate?

Our professor gave us the following question for extra credit:

What volume of NYSE traded securities today are out of the electronic system? What volume of overall of trading is any longer on the NYSE, where is the rest? (in past 5 years)

So far I have found the following from nyse.com and investopedia.com

“Though all of our markets operate electronically using cutting edge, ultrafast technology, we believe nothing can take the place of human judgment and accountability.” The following people are on the floor “to keep markets orderly[.]” There are floor brokers, who are employees of member firms who execute trades on the exchange floor on behalf of the firm’s clients. They act as agents, buying and selling stock for the public. There are also Supplemental Liquidity Providers, who are electronic, high volume members incented to add liquidity on the NYSE.

Today, all three national stock exchanges – NYSE, NYSE Arca and NYSE American – are owned by the Intercontinental Exchange (ICE), a global markets operator that also owns several other futures and options exchanges. While most trading is done electronically these days, floor traders are still used to set pricing and deal in high-volume institutional trading.

I'm having trouble finding any specific information regarding the past five years. Are there any other sites that would provide useful information?

Thank you

Submitted August 28, 2018 at 04:24PM by johnabc123 https://ift.tt/2NsvgFp