Everyone knows that Complete Games have gotten fewer and fewer in recent decades. Here are the starting pitchers most likely to complete games in the past 6 decades:

Highest CG % by decade (min. 60 gs)
decade	gs	cg	%	name
1960s	320	197	61.56	Marichal
	302	164	54.3	Gibson
	237	122	51.48	Koufax
	90	46	51.11	P. Niekro
	189	95	50.26	Spahn
	132	65	49.24	Jenkins
	104	50	48.08	Seaver
	69	33	47.83	Koosman
	205	93	45.37	McLain

 

1970s	368	197	53.53	G. Perry
	171	89	52.05	Gibson
	354	184	51.98	Jenkins
	352	175	49.72	Palmer
	333	164	49.25	Ryan
	277	133	48.01	Lolich
	245	115	46.94	Cuellar
	90	42	46.67	Sorensen
	366	165	45.08	Carlton

 

1980s	111	61	54.95	Langford
	100	45	45	M. Norris
	332	133	40.06	J. Morris
	109	40	36.7	Keough
	287	102	35.54	Valenzuela
	156	55	35.26	Geoff Zahn
	174	58	33.3	Clemens
	120	40	33.3	K. Forsch

 

1990s	210	57	27.14	Schilling
	245	61	24.9	J. McDowell
	331	75	22.66	Maddux
	290	65	22.41	R. Johnson
	155	32	20.65	J. Morris
	305	57	18.69	Clemens
	314	58	18.47	K. Brown
	109	20	18.35	B. Wegman
	109	19	17.43	B. Hurst

 

2000s	267	47	17.6	Halladay
	96	12	12.5	S. Sparks
	203	25	12.32	M. Mulder
	221	26	11.76	Schilling
	61	7	11.48	Al. Lopez
	281	32	11.39	R. Johnson

199	22	11.06	Carpenter
332	36	10.84	L. Hernandez
226	23	10.18	S. Ponson

2010s	103	18	17.48	Halladay
	76	10	13.16	C. Pavano
	134	16	11.94	Cliff Lee
	293	25	8.53	Kershaw
	203	17	8.37	C. Kluber
	230	19	8.26	Wainwright
	98	8	8.16	R. Romero
	235	17	7.23	Cueto
	232	16	6.9	C. Sale

 

Most are what you'd expect. Gibson, Marichal, Jenkins, Koufax--all top pitchers in 1960s and 1970s, and tops in finishing games, too. Clemens and Jack Morris in 1980s and 1990s; Roy Halladay head and shoulders above others in past two decades.

Those that make the list in 2 decades: Gibson and Jenins in '60s and '70s; Clemens and J. Morris in '80s and '90s; Curt Schilling and Randy Johnson in '90s and '00s; and Roy Halladay in '00s and '10s.

Surprises: Sorensen in 1970s; Langford and those 1980s A's pitchers under Billy Martin (Mike Norris, Matt Keough), 2 of 4 or 5, all of whom's careers ended early with arm trouble; Black Jack McDowell 2nd highest in 1990s (and, in top 9, Wegman and Hurst); mediocre knuckleballer Steve Sparks, 2nd in 2000s (and Mulder, Al. Lopez and Ponson down a bit further), Pavano and Remero in the 2010s.