The S&P 500 (GSPC) returned 46% between 1970 and 1980.

DATE	OPEN	HIGH	LOW	CLOSE	VOLUME
December 1980	$137.21	$140.66	$125.32	$135.76	1,025,650,000
November 1980	$129.04	$141.96	$127.23	$140.52	988,110,000
October 1980	$127.13	$135.88	$124.66	$127.47	1,031,790,000
September 1980	$123.74	$132.17	$121.79	$125.46	1,057,710,000
August 1980	$121.21	$127.78	$119.42	$122.38	965,660,000
July 1980	$114.93	$123.93	$113.54	$121.67	1,021,770,000
June 1980	$110.76	$117.98	$109.77	$114.24	829,660,000
May 1980	$105.46	$112.72	$103.50	$111.24	764,920,000
April 1980	$102.18	$106.79	$98.95	$106.29	674,140,000
March 1980	$112.50	$114.34	$94.23	$102.09	876,450,000
February 1980	$115.12	$120.22	$111.33	$113.66	956,530,000
January 1980	$105.76	$117.17	$103.26	$114.16	1,158,240,000
December 1979	$105.83	$110.33	$105.07	$107.94	710,210,000
November 1979	$102.57	$107.89	$99.42	$106.16	653,650,000
October 1979	$108.56	$112.16	$99.06	$101.82	857,930,000
September 1979	$107.44	$111.58	$105.38	$109.32	713,940,000
August 1979	$104.17	$109.84	$103.14	$109.32	825,050,000
July 1979	$101.99	$105.17	$100.35	$103.81	680,740,000
June 1979	$99.17	$103.67	$98.57	$102.91	735,710,000
May 1979	$101.68	$102.57	$97.49	$99.08	623,740,000
April 1979	$100.90	$103.95	$100.14	$101.76	620,650,000
March 1979	$96.90	$103.31	$95.98	$101.59	649,800,000
February 1979	$99.96	$100.52	$95.38	$96.28	475,710,000
January 1979	$96.73	$102.59	$95.22	$99.93	615,730,000
December 1978	$96.28	$98.58	$92.64	$96.11	492,440,000