I'm going to use my first group of characters for this example.
Generally they started out shortish because I wanted to keep the Mary Sue I had as one of the tallest. She's 5'8 (around 173 cm). There were six characters at the time, three guys and three girls, she stood at the second tallest.
As time went on I matured a little and actually started giving really personality to my characters, like the Mary Sue. There heights became more balanced with her as the 4th tallest remaining at her height. I should also mention that these characters have aged with me, they started out at around 14 and are now 17.
They're all now fairly normal with the tallest at 6'1 (185.5 cm) (male) and the shortest at 5'4 (162.5 cm) (female).
The majority of characters outside of that group however are fairly tall. I commonly keep guys somewhere between 6'0-6'2 (183cm-188cm) and girls from 5'5-5'7 (156cm-170cm). They rarely fall under those margins but commonly exceed past them.