EDIT: EVERYONE! The Blaine Column has been edited because as many of you pointed out the graph was wrong- it was reading the wrong column in my spreadsheet and only had Season 3 solos!!!!
"All of the solos, duets, and solos in a group number from episodes 1x1 "Pilot" through 3x12 "The Spanish Teacher"- click to enlarge!"

EDIT: EVERYONE! The Blaine Column has been edited because as many of you pointed out the graph was wrong- it was reading the wrong column in my spreadsheet and only had Season 3 solos!!!!

"All of the solos, duets, and solos in a group number from episodes 1x1 "Pilot" through 3x12 "The Spanish Teacher"- click to enlarge!"