What year does Jihai refer to?

1899, 1959, etc. There are ten heavenly stems, namely, A, B, C, D, E, Ji, G, Xin, Man and Ghost, and twelve earthly branches, namely, Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai. The year of Jihai is one of the first years of the lunar calendar, such as 1899, 1959, 20 19, etc.