Table:
0
A
B
C
D
E
F
1
Year
Division
League
Reg. Season
Playoffs
Open Cup
2
1995
3
USISL Pro League
1st, Western North
Sizzling Nine
Did not qualify
3
1996
3
USISL Select League
1st, Pacific
Champions
First Round
4
1997
2
USISL A-League
1st, Pacific
Division Semifinals
Did not qualify
5
1998
2
USISL A-League
7th, Pacific
Did not qualify
Did not qualify
6
1999
3
USL D3-Pro League
4th, Western
Did not qualify
Did not qualify

Questions and formulas:
Question: How many years was there a team that was part of the usisl pro league?
Formula: ROWS(FILTER(A1,C1="usisl pro league"))
Formula2: ROWS(FILTER(A2:A6,C2:C6="usisl pro league"))
Level: easy