If...Then.. Formula needed to recognize employee name and calculate percentage

Column A has list of employee names (some repeating multiple times)
Column B has yes or no


A -----B
Name1 yes
Name1 yes
Name no
Name2 no
Name2 yes
Name3 no
Name3 no
Name3 yes



I need to return a percentage (of yes') for each employee.
I want to match or recognize the name in column 1, then calculate the percentages for all of that employee's yes' or no's.

Right now I'm using this:
=COUNTIF(A1:A5,"YES")/COUNTA(A1:A5)
But this fails to help me, as I count the rows, looking to see how many rows each employee fills (eg, A1:A5) and the actual spreadsheet I'm working on has 3000+ lines...

After reviewing your question, I believe what you are looking for is a % of answers marked "YES" for each employee. You can achieve this with a pivot table.

1. Highlight A:B, Insert Pivot
2. Drag column B with your Responses to Column Labels
3. Drag column A with your Names to Row Labels
4. Drag Response field from list to Values
5. Right click one of the numbers in the yes column and Show Value as % of Row Total

Thanks,
Newb