What is the total value of Henderson Land Company 1990?

By March of 1990, the total market value of Henderson Land Company reached 10693 million Hong Kong dollars, and the total market value of Henderson Land Development Company also reached 4.085 billion Hong Kong dollars. In addition, China Gas, with a total market value of HK$ 107 1 billion, holds 29.7% and 32.5% through Henderson Land. The total market value of the four major companies is nearly HK$ 26.5 billion, which is far from the original 654.38+0.5 billion.