code numbers or key numbers

gradings, ratios

I don't see how 'numbers' would fit in -
I'd go for 'gradings' or 'ratios'

http://eurodic.ip.lu:8086

"...consistently monitored by means of key numbers", i.e. following specific figures that will indicate to what extent these goals are being achieved.

key numbers
index numbers
key figures
index figures

nothing to add, but in a sense of democracy I would like to give my vote to ratios for this context

Yours Mike Harold

Just to confuse matters even more, here is another suggestion. It does seem that the accepted 'German-English' translation of 'Kennzahlen' in a financial context is 'key figures'-see for example the title of the quoted web page. I have my doubts about the validity of this translation, because 'key figures' in genuine English language texts that I can find refers to people who played a prominent role in some event or other. The precedent nevertheless exists for using 'key figures' here.
Can this really be 'ratio'? Isn't a ratio something quite different from a 'Zahl', it is rather the relationship between two figures. Don't we mean here that certain fundamental figures (maybe sales, stock, debt) will be used as a yardstick to measure performance? Hopefully, there is more context which makes this clear.

This is probably the safer term, as we don't know for sure that performance ratios are involved.