Demand does change the price. You can see the price drop during economic downturns. Supply and demand are two sides of a single equation. It simply doesn’t make sense to say that only one impacts prices.
Prices had been dropping recently despite KSA reducing supply, until the attacks in Israel that is.
In Ireland it’s about 48% on everything above €40k, then 52% above €70k.
That by itself could be misleading though, the overall effective tax rate for someone on €40k is 18%, around 30% at €70k. The thresholds will rise next year.