How ACT overtook SAT as the top college entrance exam

1986: 730,000 students took the ACT compared with 1,000,748 who took the SAT. 
1996: 924,663  took the ACT; 1,084,725 took the SAT.
2006:  1,206,455 took the ACT; 1,465,744 took the SAT.
2011:  1,623,112 took the ACT; 1,647,123* took the SAT
 2012: 1,666,017 took the ACT; 1,664,479* took the SAT
So, how did this happen?

photo via flickr:CC | Newton Free Library

How ACT overtook SAT as the top college entrance exam

1986: 730,000 students took the ACT compared with 1,000,748 who took the SAT.

1996: 924,663  took the ACT; 1,084,725 took the SAT.

2006: 1,206,455 took the ACT; 1,465,744 took the SAT.

2011: 1,623,112 took the ACT; 1,647,123* took the SAT

2012: 1,666,017 took the ACT; 1,664,479* took the SAT

So, how did this happen?

photo via flickr:CC | Newton Free Library