merging queries

Hi Friends,

I have eight (8) sql queries being run againts one table that eat lots
of resources because its being run eight times. I just feel i can merge this queries into one, but im confused how.

Can you help me please.... Thanks a lot

select count(*) from departure_all partition (depart2006)
where to_char(exit_date,'MON')='MAY' AND PORT='A' AND SUBSTR(CITZ,1,2)='PH';

select count(*) from departure_all partition (depart2006)
where to_char(exit_date,'MON')='JUN' AND PORT='A' AND SUBSTR(CITZ,1,2)='PH';

select count(*) from departure_all partition (depart2006)
where to_char(exit_date,'MON')='MAY' AND PORT='A' AND SUBSTR(CITZ,1,2)<>'PH';

select count(*) from departure_all partition (depart2006)
where to_char(exit_date,'MON')='JUN' AND PORT='A' AND SUBSTR(CITZ,1,2)<>'PH';

select count(*) from departure_all partition (depart2006)
where to_char(exit_date,'MON')='MAY' AND PORT='B' AND SUBSTR(CITZ,1,2)='PH';

select count(*) from departure_all partition (depart2006)
where to_char(exit_date,'MON')='JUN' AND PORT='B' AND SUBSTR(CITZ,1,2)='PH';

select count(*) from departure_all partition (depart2006)
where to_char(exit_date,'MON')='MAY' AND PORT='B' AND SUBSTR(CITZ,1,2)<>'PH';

select count(*) from departure_all partition (depart2006)
where to_char(exit_date,'MON')='JUN' AND PORT='B' AND SUBSTR(CITZ,1,2)<>'PH';