Rebased index number?

[Scooby-Doo]

Calculate the index number of visits to lakefield farm for 1997 with 1995 = 100 (indicated by ##) = 106.5

Calculate the rebased index number of UK visits to farms for 197 with 1995 = 100 (indicated by // in table)

http://img166.imageshack.us/my.php?image=dumvov5.jpg

Picture of table: http://img166.imageshack.us/my.php?image=dumvov5.jpg

[Scooby-Doo]

If anyone has any idea how to do this please let me know, i realy nedd to get it done today and i dnt understand it!