http://www.who.int/mental_health/prevention/suicide/suiciderates/en/
Suicide Rates (per 100,000), by country, year, and gender.
CHINA (Selected rural & urban areas) 1999 Males: 13.0 Females: 14.8
CHINA (Hong Kong SAR) 1999 M: 16.7 F: 9.8
Elsewhere suggests a 3:1 ratio of rural:urban suicides. I.e., of the 13 males per 100,000 a year who commit suicide, 3/4 are in rural areas.
With 400,000 Employees, you would expect 13 - 15 suicides a year, depending on your employee mix (males:females).
Sadly, the suicide rate in China is a lot higher than elsewhere in the world, but this is mostly due to the rural suicide rate being so high.