salam,
Please explain
what is meant by 'Percentage of GDP''?
For example
''8.0% fiscal deficit of GDP''
and
''3.50% of GDP''.

Fiscal deficit :
When a government's total expenditures exceed the revenue that it generates (excluding money from borrowings). Deficit differs from debt, which is an accumulation of yearly deficits.
Government deficit or surplus is the difference between government receipts (mainly tax revenue) and government spending (i.e. salaries of government employees, social benefits, interest on the public debt) in a single year. A deficit occurs when the outlays of a government exceed the inlays; a surplus is when revenues are higher than expenditure. This ratio is usually presented as a percent of gross domestic product (GDP).

Debt to GDP ratio:
A measure of a country's federal debt in relation to its gross domestic product (GDP). By comparing what a country owes to what it produces, the debt-to-GDP ratio indicates the country's ability to pay back its debt.

@ Dr Shabbir Ahmed
thanks for your prompt reply. I got almost 90% of my query. But, one more question: what would be called as a lethal value of fiscal deficit... , Which is currently 8.8% of GDP of Pak?

go through the following link. all your concepts related to fiscal deficit will be cleared.
https://en.wikipedia.org/wiki/Government_budget_balance