复盘A股35年走势，上证指数创出十年新高后会发生什么？目前沪指即将创十年新高，板块行情如何演绎？

Core Viewpoint - The recent surge in the A-share market has seen the Shanghai Composite Index reach a peak of 3704.77 points, approaching the ten-year high of 3731.69 points set on February 18, 2021, marking a significant milestone for the market and investors [1] Historical Context - The Shanghai Composite Index has only surpassed its ten-year high twice in the past 35 years, first on February 17, 2000, and then on December 14, 2006 [2][4] - The first instance in 2000 led to a significant sell-off, with a 3.1% drop on the same day, followed by a period of volatility before a sustained upward trend lasting nearly 1.5 years, culminating in a peak of 2245.42 points on June 14, 2001, representing a 27.86% increase from the previous high [4][6] - The second instance in 2006 resulted in a strong upward trend, with the index reaching 6124.04 points by October 16, 2007, a maximum increase of 172.73% from the previous high [6] Trading Volume Trends - Prior to both instances of reaching a ten-year high, the daily trading volume of the Shanghai Composite Index had already set historical records, indicating strong market interest [6][8] Market Behavior Pre and Post New Highs - In the three months leading up to the ten-year high in December 2006, the market exhibited structural behavior, with the top ten performing industry indices averaging a 62.25% increase, while the bottom ten indices averaged a decline of 0.54% [8][9] - After the ten-year high was reached, the market shifted to a broad-based rally, with the Shanghai Composite Index increasing by 30.71% and most industry indices outperforming the index itself [9][10] Correlation Analysis - A negative correlation of -0.35 was observed between the performance of industry indices in the three months before and after the ten-year high, suggesting that industries that performed well prior may lag in the subsequent period [9] - Notably, the securities industry showed strong performance both before and after the new high, with increases of 73.44% and 86.15%, respectively [9] Extended Analysis - The trends observed in the three-month periods before and after the ten-year high also held true for the six-month periods, although the correlation between industry performance before and after diminished to 0.01, indicating a shift in market dynamics [11]