Real per capita GDP in China in 1959 was about $350, but it…

Real per capita GDP in China in 1959 was about $350, but it doubled to about $700 by 1978, when Deng Xiaoping started market reforms. Chinese real per capita GDP doubled again in only seven years, reaching $1,400 by 1986. What was the average annual economic growth rate between 1959 and 1986?