How many runes to a dollar?

I'm curious to know, how many runes correspond to a single dollar? Could you please elaborate on the exchange rate between these two currencies? I'm trying to understand the value of runes in relation to our conventional monetary system. Is there a fixed rate, or does it fluctuate based on market conditions? I'm interested in both the current exchange rate and any potential trends or patterns that might affect it. Could you provide some insight into this matter?