In which year was the traditional Chinese medicine culture of Beijing Tongrentang rated as intangible cultural heritage?

Tongrentang Chinese medicine culture, one of the traditional medicines in China, is declared by Beijing Tongrentang (Group) Co., Ltd. and is one of the national intangible cultural heritages.

Tongrentang's traditional Chinese medicine culture is embodied in the values of "practicing kindness with peers and saving the world's health", the quality concept of "afraid to save labor even though the processing is complicated, afraid to reduce materials even though the taste is expensive", the business philosophy of "stressing honesty and valuing human feelings", the professional ethics of "treating children equally", and the brand and unique symbol of Tongrentang.