求翻译：张军等（2003）运用回归分析法，计算了1952—1998年中国经济的全要素生产率及其增长率，结果发现，改革前中国经济的TFP波动很大。是什么意思？

Zhang et al (2003) used regression analysis to calculate the 1952-1998 years of the Chinese economy and its growth rate of total factor productivity, found that the pre-reform China's economy TFP fluctuated considerably.

Zhang Jun, using regression analysis ( 2003) 1952 - 1998, calculated the total factor productivity of China's economy and its growth rate, it was found that, before the reform of China's economic TFP fluctuate greatly.

Zhang Jun and so on (2003) utilization return analytic method, has calculated 1952-1998 year Chinese economy entire essential factor productivity and the rate of increment, finally discovered, before the reform the Chinese economy TFP undulation is very big.

Zhang June (2003) the application of regression analysis, calculation of total factor productivity of China's economy and its growth rate in 1952-1998, and found that, before the reform of China's economy TFP volatile.

Zhang et al (2003) used regression analysis to calculate the 1952-1998 years of the Chinese economy and its growth rate of total factor productivity, found that the pre-reform China's economy TFP fluctuated considerably.