[Pawn] How to decrease SetPlayerWantedLevel every 5 seconds?

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Code:

forward DeceraseWantedLevel(playerid);
public DecreaseWantedLevel(playerid)
{
    new level = GetPlayerWantedLevel(playerid);
    if(!level)
        return;

    SetPlayerWantedLevel(playerid, --level);
}

// Somewhere in your script
SetTimerEx("DecreaseWantedLevel", true, 5 * 1000, "d", playerid);