I remember 1997, a few hundred RMB was exchanged for 100 Hong Kong dollars. In the 1970s and 1980s, RMB was much more valuable than Hong Kong dollars. At that time, RMB in 30 yuan could be exchanged for 100 HKD. However, ordinary people could not exchange foreign currency at that time. Later, in order to earn foreign exchange through exports and increase the competitiveness of China's goods, the RMB exchange rate began to depreciate.