The February 2009 Obama stimulus got added to Bush's 2009 fiscal year spending because Democrats controlled both the House and the Senate at the time. It was scandalous, but there was nothing Republicans could do about it.
But the same thing happened every year thereafter because the Democrat Congress and then the Republican Congress deliberately passed this prior spending in the form of continuing resolutions instead of through regular order, which meant nothing got debated and the status quo was maintained. That's the evil of CRs.
Both parties did this on purpose instead of debating individual spending bills because . . . THEY ALL LOVE HAVING THE MONEY TO SPEND.
The fiscal 2008 baseline outlays were $2.9825 trillion, to which the stimulus got added for fiscal 2009, and just kept getting added and re-added and re-added right through to the present (and then some) through the continuing resolution process:
2009: $535.2 billion ($3.5 trillion)
2010: $474.6 billion ($3.5 trillion)
2011: $620.6 billion ($3.6 trillion)
2012: $554.5 billion ($3.5 trillion)
2013: $472.1 billion ($3.5 trillion)
2014: $523.6 billion ($3.5 trillion)
2015: $776.1 billion ($3.8 trillion)
2016: $1.017 trillion ($4.0 trillion).
The giant joke on the American people here is that Republicans went right along with this charade the whole time Obama was president, even after they got control of both the House and the Senate in 2014. Almost $5 trillion in "stimulus" has already been spent.
And Trump wants to add another $1 trillion?
Meanwhile under Obama current dollar GDP increased . . . $4.1 trillion. All government spending. All totally phony. And overpriced at that: $1.21 spent for every dollar of that fake GDP.