Progressive function

[ambahnhof]

I'm trying to figure out a protected formula. Following data:

2.00 - 2.00
1.90 - 2.11
1.80 - 2.25
1.70 - 2.43
1.60 - 2.67
1.50 - 3.00
1.40 - 3.50
1.30 - 4.33
1.20 - 6.00
1.10 - 11.00

I'm sure there's a (quite simple) formula for this, but I can't seem to get my head straight on this. Can anybody tell me the formulas for both directions?

Thanks.

[ambahnhof]

Never mind, figured it out myself. For those interested:

A1=+B1/(B1-1)
B1=1/(A1-1)+1

Thanks.