In slope-intercept form y-b = m(x-a). We have (a,b) = (2001,6680) for example. Calculate m:
m = (y1 - y2)/(x1-x2) for two points (x1,y1) and (x2,y2)
So in slope-intercept form:
y - 6680 = 640 ( x - 2001 )
And for 2013, substitute the value for x in and solve:
y - 6680 = 640 ( 2013 - 2001 )
y = 6680 + 12*640
= 14360 vehicles
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