Suit yourself ..you provides 1yr 8 month old source..which not exactly recent..you have have had two union budgets after that...going from 2.5% to 1.5% is not that big a stretch.
But can you come up with a source that says that? A reliable source, that is, from an organization such as UN? Not a website that does not provide source for what it claims.
Tradingeconomics says that Pakistan spends 2.7% on health in 2007.
Health expenditure; total (% of GDP) in Pakistan
So wherever you go (at least as far more reliable sources are concerned), you won't find ridiculous figures such as 0.5%.