I look at the exchange rate every day, and the strength of the Yuan means effectively we are working for less money.

Not sure that this is the case Linguist. The strength of the Yuan means that if you convert the cash into another currency, say USD, Euros, Aus$ or GB pounds, you get more of those currencies not less for your Yuan when returning home for your holidays etc.
Last year an average? salary of 6000Yuan would have bought you 600 Euros, today you will receive 690 Euros. Lets hope the Yuan stays strong as all the major currencies are getting weaker day by day.