Examples steadfast adherence in German examples

How do I translate steadfast adherence into German?

News and current affairs

MILAN - The US Federal Reserve has finally, after almost a decade of steadfast adherence to very low interest rates, hiked its federal funds rate - the rate from which all other interest rates in the economy take their cue - by 25 basis points.

MAILAND - Die US-Notenbank (Fed) hat nach fast einem Jahrzehnt stetig sehr niedriger Zinsen endlich die Federal Funds Rate (den US-Leitzins, an dem sich alle anderen US-Zinssätze orientieren) um 25 Basispunkte erhöht.