translate following paragraph in Chinese in 2019, thanks to the development of the science and technology board, the exit channels of VC/PE institutions have improved, and the number of exits in the Chinese equity investment market is 2948, a year-on-year increase of 19.0%; the number of IPOs of invested companies was 1,573, a year-on-year increase of 57.9%. 651 of the 1,573 IPOs of the invested companies were contributed by the science and technology board, accounting for 41.4%