How Much Do Chinese Need to Pay as a Bride Price ( 彩礼) before getting married?

Chinese tradition requires the grooms family to give a monetary gift to the brides family before they can get married. How much are they supposed to give?
In this video Esther asks people on the streets in China about how important the Bride price is in modern China.

彩礼 -(Cai li)  Bride Price, the amount of money the grooms family should give the the brides family before they are allowed to be married.