The Federal Reserve uses linear regressions to try to establish a link between the unemployment rate (x) and monthly home sales in the 12th District (y). The following data are available:

Unemployment rate, x	Home Sales, y
11	150
13	140
15	100
17	110

The slope term (b) in the estimated regression equation turns out to be -8. The intercept term (a) is 237. Explained variation (SSR) here would be _______.