Monero always kept their initial schedule and never changed it
(unlike other coins, like DASH which lowered their total emission several times and where more than 20% of the current supply was mined in the first hours: https://bitcointalk.org/index.php?topic=421615.msg13017231#msg13017231)

Monero merely catches up with bitcoin emission, and will eventually have more coins than BTC, due to the minimum block reward starting in 2022: