I've been playing a bit with the numbers.
Unless I did something terribly wrong, I got:
On average how many bonuses are captured in given turn:
T1	T2	T3	T4	T5	T6+	total
0.1565	1.5085	0.9484	0.7608	0.6087	3.4061	7.3889
Which frankly I find that a bit odd. Surprised so few bonuses captured turn 3+, so many few total, especially considering those numbers are joint for 2 players. Maybe some games simply ended early, but still, only 3,37 in first 4 turns?