日 期上证A股深证综指深证成指沪深300上证180中小板上证B股深证B股 1990-12-3131.82% 1991-1-315.94% 1991-2-285.24% 1991-3-299.34% 1991-4-306.91%10.71% 1991-5-318.66%10.07% 1991-6-2819.74%12.34% 1991-7-318.67%16.99% 1991-8-3024