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I think this is the section you posted?

Approximate cumulative real GDP growth (total multiplicative increase)

These are simple compounds of representative average annual rates over 24 years:

Red-leaning group (~2.4% average annual): Growth factor ≈ 1.77 → ~77% total cumulative real growth.
Blue-leaning group (~1.9% average annual): Growth factor ≈ 1.57 → ~57% total cumulative real growth.
U.S. overall (~2.1%): Growth factor ≈ 1.65 → ~65% total cumulative real growth.

Slightly higher/lower averages shift the totals meaningfully because of compounding:

2.5% annual → ~81% cumulative.
2.3% annual → ~73% cumulative.
2.0% annual → ~61% cumulative.
1.8% annual → ~53% cumulative.

In other words, an average red-leaning state ending the period with roughly 1.2–1.3× the real output of an otherwise comparable starting point relative to an average blue-leaning state (before differences in starting size, population change, or industry mix). High performers (e.g., North Dakota, Utah, Texas, Washington, Idaho) more than doubled in some cases; lower performers grew far less.