As you want to know the IAF present (2011) and future (2020) Strength

IAF - 2011 Actuel Strength

Fighter
MIG 21Bison - 121
MIG 29 - 69
SU-30 Mki - 130

Attack
Jaguar - 120
MIG 27 – 145

Multirole
Mirage – 51

Trainer
Deepak - 70
Kiran - 80
Hawk – 39

Tactical Transport
An 32 Medium lift - 105
Il 76 Heavy lift – 24

AEW&C (airborne early warning and control)
Phalcon - 3

Tanker
Il 78 – 6

IAF – 2020 Future Strength:-

Fighter
SU 30 Mki - 270
LCA – 200 (1seat), 20 (2 seat)
FGFA – 200 (2seat), 50 (1seat)

Attack

Multirole
MRCA - 126
AMCA – 250
MIG 29 – 69 (Upgraded to mutlirole)
Mirage H – 51 (upgraded to 5MK2multirole)

Trainer
Trainer - 181
HAL HJT36 SITARA – 73

Tactical Transport
C17 – 10 (Heavy transport)
C130J – 6 (Medium transport)
SPARTAN C27J – 16 (Medium transport)
IL214 – 45 (Medium transport)
NAL SARAS – 15 (Light transport)

AEW&C (airborne early warning and control)
EL/M-2075 Phalcon - 6
DRDO – 24
Beriev A-50 Shmel – 6

Tanker
Il 78 – 6

Helicopters
Heavy lift – 15
Combat – 22
Mi17V5 – 139 (18000 feet altitude)
AW101 – 12
Light – 317 (125:IAF) (197:IA)
HAL LCH - 65