Indy
Sov
Index to obtain to maintain anom
1 750,000 375,000 Small
2 1,500,000 750,000 Medium
3 3,000,000 1,500,000 Large
4 6,000,000 3,000,000 Enormous
5 12,000,000 6,000,000 Colossal

Small Medium Large Enormous Colossal
Arkonor: 9,600 28,000 29,900 58,000 60,800
Bistot: 12,800 38,700 57,000 86,000 114,300
Crokite: 30,000 84,700 124,000 169,000 225,200
Dark Ochre: 16,000 31,000 60,000 50,000 115,000
Gneiss: 170,000 340,000 313,500 540,000 630,000
Spodumain: 300,000 270,000 368,100 542,000 736,200
Mercoxit: 0 2,600 3,500 5,200 7,000

*CCP figures. Your mileage may vary.

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Diminishing Returns:
1st = Fully effective (100%)
2nd ≈ 87% effectiveness
3rd ≈ 57% effectiveness
4th ≈ 28% effectiveness
5th ≈ 10% effectiveness
6th ≈ 3% effectiveness