Actually the years are as follows...
The Current Logo came in around June 1998
The 70s Logo was used from around 1972 until 1986
90s Logo first appeared in Feb 95 and stayed until the current one
Logo from the 80s appeared in 1986 but vanished at the end of 88, this was replaced by another one (Jan 89-Sept 91) that is not listed above (although TV-ark should have this really soon as I have sent them this to upload)
The 90s logo (Which I always thought was terrible) ran from TOTPs move to Elstree in October 91 and used for the final time in Feb 95.
The theme tunes that went with these were:-
70s logo - Whole Lotta Love (CSS), Yellow Pearl (Phil Lynott)
80s logo - The Wizard (Paul Hardcastle)
80s logo (not shown) - The Wizard (Paul Hardcastle)
90s logo (91-95) - Now get out of that (Tony Gibber)
90s Logo (95-9

- Red Hot Pop (Vince Clarke)
Current Logo - Whole Lotta Love (Bad man bad, Led Zepplin)
Hope this helps.
Keith