Cross Tab Functions

Hello All,
I have used the cross tab function to setup tables that display months'
data, however i need to display years data instead of the months so i
would display 2006 as a column, 2007 as a colum and 2008 as a column. when i
tried to modify the simple example of the cross tab (shown below)
SELECT i.item_name::text As row_name, to_char(if.action_date, 'year')::text
As bucket,
SUM(if.num_used)::integer As bucketvalue
FRM inventory As i INNER JIN inventory_flow As if
N i.item_id = if.item_id
WHERE (if.num_used <0 AND if.num_used IS NT NULL)
AND action_date BETWEEN date '2007-01-01' and date '2008-12-31 23:59'
GRUP BY i.item_name, to_char(if.action_date, 'year'), date_part('year',
if.action_date)
RDER BY i.item_name, date_part('year', if.action_date);

basically i changed the mon and the month to be year the system displayed
something that i am not sure about. is there a command that converts the
year similar to the mon

Help againPlease