which was about 1.5% less than that in mid-Jan 2022, so in $ it's a bit lower than $18 trillions

https://www.exchangerates.org.uk/USD-CNY-spot-exchange-rates-history-2021.html

Original (prelim) report from Stat Bureau: 

https://www.stats.gov.cn/tjsj/zxfb/202201/t20220117_1826404.html