* Only participating at Indy 500 (Round 6)

[1] Participating at rounds 1, 3–4, 7–8, 10–12, 14–15

[2] Participating at rounds 2, 5–6, 9, 13, 16–17

[3] Participating at rounds 1, 3–5, 7–8, 10, 12–13, 16–17

[4] Participating at rounds 2, 6, 9, 11, 14–15

[5] Participating at rounds 1, 4, 12–13

[6] Participating at rounds 2–3, 5–6

[7] Participating at rounds 1, 3, 6, 13, 16–17

[8] Participating at rounds 5–6