Before the start of ICC World T20...

I am not a firm believer of stats when it comes to performance on the ground but still its worth to have a look at:

Comparison of performance of teams in T20I matches and ICC Twenty20 World cup matches

Team	T20I played	won	lost	w/l ratio	T20 WC matches played	won	lost	w/l ratio
PAKISTAN	30	22	7	3.14	14	10	3	3.33
SOUTH AFRICA	26	17	9	1.88	11	9	2	4.50
AUSTRALIA	29	15	12	1.25	8	3	5	0.60
SRI LANKA	25	15	10	1.50	12	9	3	3.00
NEW ZEALAND	33	13	17	0.76	11	5	6	0.83
ENGLAND	25	10	14	0.71	10	3	7	0.42
INDIA	20	10	8	1.25	12	6	4	1.50
WEST INDIES	21	8	11	0.72	8	3	5	0.60
BANGLADESH	14	3	11	0.27	7	1	6	0.16
ZIMBABWE	8	3	4	0.75	2	1	1	1.00