Reagan had Democrat Congresses the whole time he was in office. All of his budgets were negotiated with the Democrats. Thus not all of the growth was due to his policies.
A number of programs were put in place by recent prior presidents: Johnson, Nixon & Carter.; EEOC, OSHA, EPA, Medicare & Medicaid and expansions, poverty programs and expansions. Because of these programs we went through a period of "Stagflation" - low economic growth and high inflation. (Double digit inflation. And double digit interest rates.) I bet Reagan's compounded rate, would be much lower, if it were adjusted for inflation.
In contrast, the Democrats were in control of Congress from Jan-2007 through Jan-2011, that's four years, two overlapping Obama's term in office Plus Obama was part of the Congress in 2007 to 2009. Plus Obama is still president and the Democrats still control the Senate. Thus all of the spending can be considered Democrat approved spending and by implication Obama approved spending. (This includes the 2008 fiscal year budget which Obama likes to blame on Bush, even though he was consulted on every dollar in it (as either a Senator or President elect) and modified it and added to it in 2009.)
If you believe what the Democrats have been telling us, we've had low inflation. And we've had artificially managed low interest rates.
So basically, you are comparing data and time periods that are not very comparable, to make a claim that has no validity. But then, you are a lying Progressive. What else could we expect?