Here's some actual figures from files (.exe) I have.
(32-bit only)
11.1.102.63 3,767,456
11.1.102.63 (IE) 3,804,320
(32/64-bit)
11.4.402.287 (IE) 9,575,864
11.4.402.287 10,220,472
(32/64-bit)
11.5.502.110 (IE) 15,734,200
11.5.502.110 16,361,912
The latest installers are about 1.6x bigger.