Alright then, here's the revised table:
1: 50
2: 100
3: 250
4: 500
5: 750
6: 1000
7: 1500
8: 2000
9: 2500
10: 3000 (threshold for Town Hall and other buildings that used to require size 6, ideal max for Prehistoric era)
11: 4000
12: 5000
13: 7500
14: 10,000
15: 15,000
16: 20,000
17: 30,000
18: 40,000
19: 50,000
20: 60,000 (threshold for City Hall and other buildings that used to require size 13, ideal max for Ancient era)
21: 70,000
22: 80,000
23: 90,000
24: 100,000
25: 125,000
26: 150,000
27: 175,000
28: 200,000
29: 225,000
30: 250,000
31: 300,000
32: 350,000
33: 400,000
34: 450,000
35: 500,000
36: 550,000
37: 600,000
38: 650,000
39: 700,000
40: 750,000
41: 800,000
42: 850,000
43: 900,000
44: 950,000
45: 1,000,000 (threshold for Metropolitan Administration and other buildings that used to require size 25, ideal max for Classical/Medieval/Renaissance era)
46: 1,100,000
47: 1,200,000
48: 1,300,000
49: 1,400,000
50: 1,500,000
51: 1,600,000
52: 1,700,000
53: 1,800,000
54: 1,900,000
55: 2,000,000
56: 2,250,000
57: 2,500,000
58: 2,750,000
59: 3,000,000
60: 3,500,000
61: 4,000,000
62: 5,000,000
63: 6,000,000
64: 7,000,000
65: 8,000,000
66: 9,000,000
67: 10,000,000
68: 12,000,000 (ideal max for Industrial era)
69: 14,000,000
70: 16,000,000
71: 18,000,000
72: 20,000,000
73: 22,250,000
74: 25,000,000
75: 25,750,000
76: 30,000,000
77: 35,000,000
78: 40,000,000
79: 45,000,000
80: 50,000,000
81: 55,000,000
82: 60,000,000
83: 65,000,000
84: 70,000,000
85: 75,000,000
86: 80,000,000
87: 85,000,000
88: 90,000,000
89: 95,000,000
90: 100,000,000
91: 110,000,000
92: 120,000,000
93: 130,000,000
94: 140,000,000
95: 150,000,000
96: 160,000,000
97: 170,000,000
98: 180,000,000
99: 190,000,000
100: 200,000,000
If anyone gets beyond 100, even under my 10,000 turn scenario, I'll be astounded, but I'll be happy to bring it up to 200.