there are a variety of models the Australian, the Indian, the German ..each model has their own benefits as well as failures. You can google all the sources and information you need under keywords like "fiscal federalism" in combination with "Pakistan" or if you'd like to read about other models ..the Indian Finance Commission or australian Commonwealth Grants Commission.
Here is the NFC award structure for Pak.
Punjab
population= 95 million (spends $6 billion)
Sindh
population = 39 million (spends $4 billion)
NWFP
population = 27 million (spends $2.7 billion)
Balochistan
Population = 9 million (spends $1 billion).
Total provincial expenditure per year = $14 billion
Pakistan's total federal budget = $30 billion (that means $16 billion to take care of loan/interest payments, imports, military, federal expenses on government, medical, pensions etc.).
What do you think is the equitable distribution of funds to replace the above figures in light of Indian / Australian / Canadian system.
Make sure you keep in $ billion.
Thank you.