It will be more helpful before booking a ticket if you add a link which would show the trends of diff WL/RAC status by inputting:-
1) Train no
2)Days left before journey
3)WL/RAC status
E.g:-...
more...
Suppose I want to book a ticket from JSG to CST in Gitanjali exp(12860) on 3rd July2015 in which present availability is RLWL25/WL17. Before that I want to know some past trends of last two months for similar status by inputting
1) Train no-12860
2) Days left-8
3) Status-RLWL25/WL17
Note:-It should not require any PNR to input