The following partial information is taken from the comparative balance sheet of Levi Corporation:

Shareholders equity	12/31/2018				12/31/2017
Common stock, $5 par; 32 million shares authorized; 27 million shares issued and 21 million shares outstanding at 12/31/2018; and ____million shares issued and ____shares outstanding at 12/31/2017.	$	135	million		$	105	million
Additional paid-in capital on common stock		519	million			391	million
Retained earnings		196	million			156	million
Treasury common stock, at cost, 6 million shares at 12/31/2018 and 4 million shares at 12/31/2017		(71	million)			(49	million)
Total shareholders equity	$	779	million		$	603	million

How many of Levi's common shares were outstanding on 12/31/2017?