As of Wave 9

Unique
104 chars
159 spaces
11030 points
63.37 points/space

Common4: points > 0 and < 60
17 chars
54 spaces
715 points
13.24 points/space

Common3: points >= 60 and < 80
16 chars
55 spaces
1085 points
19.73 points/space

Common2: points >= 80
17 chars
65 spaces
1720 points
26.46 points/space

Common4 (x4)
216 spaces
2860 points
Common3 (x3)
165 spaces
3255 points
Common2 (x2)
130 spaces
3440 points
Commons
511 spaces
9555 points
18.69 points/space

1 Unique space (63.37) to 9 Common spaces (18.69 x 9 = 168.21)
(168.21 + 63.37) / 10 = 23.16
23 points / space !!!