Table:
0
A
B
C
D
E
F
1
Artist
Country
Number-one single(s)
Year
Weeks at #1
Straight to #1 ?
2
East 17
United Kingdom
" It's Alright "
1994
1
No
3
Eiffel 65
Italy
" Blue (Da Ba Dee) "
1999
3
No
4
Eiffel 65
Italy
" Move Your Body "
2000
4
No
5
Elsa
France
" T'en va pas "
1986
8
No
6
Elsa
France
" Un Roman d'amitié "
1988
6
No
7
Enigma
Germany, Spain
" Sadeness (Part I) "
1990
5
No

Questions and formulas:
Question: How many years have a weeks at #1 value of exactly 8?
Formula: ROWS(FILTER(D1,E1=8))
Formula2: ROWS(FILTER(D2:D7,E2:E7=8))
Level: easy