Table:
text: List of artists who reached number one on the French Singles Chart
E
E
Artist Country Number_one_singles Year_ Weeks_at_1 Straight_to_1_
East 17 United Kingdom  It`s Alright  1994 1 No
Eiffel 65 Italy  Blue (Da Ba Dee)  1999 3 No
Eiffel 65 Italy  Move Your Body  2000 4 No
Elsa France  T`en va pas  1986 8 No
Elsa France  Un Roman d`amitié  1988 6 No
Enigma Germany, Spain  Sadeness (Part I)  1990 5 No

Question: List of artists who reached number one on the French singles chart, E, how many years does weeks at number 1 have a value of exactly 8?