Government data show that the percentage of people over 65 who still work has been rising since the mid-1990's.
In fact, between 1998 and 1999, both percentages rose, after falling for several years.
That percentage rose to 32 in 1984 and was estimated at 33 percent for 1992.
"There is no evidence that these low percentages will rise."
The percentage of China's population living in cities rose from 13% to 40.4% between 1950 and 2005.
This percentage has been rising for the last three years.
The five whose percentages rose did not make significant gains.
That percentage rose to 17.1% by the end of the study.
But the percentage rose to 43.3 in 1982 and 51.9 as of last March.
In the March local voting, the percentage rose to 19 percent.