The four numbers - 2004-2005, - 2003-2004, - 98-99, - 97-98 are in the order from small to large, Please do it in a way I can understand, OK, What's going on

The four numbers - 2004-2005, - 2003-2004, - 98-99, - 97-98 are in the order from small to large, Please do it in a way I can understand, OK, What's going on


-2004/2005