This is a breakdown of the last 4 year's of results from the North Carolina database. The following times and marks are the 50th best in the state each year. You can see that in some events the girl's have really showed some improvement. Overall, the state seems pretty consistent.
The events that have seen the biggest improvement for girls over the last 4 years are:
100m Hurdles; 800m; 1600m; 3200m; 4x400m relay; 4x200m relay
100 meters
2010 – 12.46
2009 – 12.44
2008 – 12.53
2007 – 12.51
200 meters
2010 – 25.76
2009 – 25.64
2008 – 25.87
2007 – 25.82
400 meters
2010 – 59.66
2009 – 59.61
2008 – 59.74
2007 – 1:00.16
800 meters
2010 – 2:23.79
2009 – 2:26.30
2008 – 2:26.70
2007 – 2:26.64
1600 meters
2010 – 5:23.66
2009 – 5:26.11
2008 – 5:29.45
2007 – 5:31.30
3200 meters
2010 – 11:55.87
2009 – 12:02.50
2008 – 12:10.10
2007 – 12:04.27
100 meter hurdles
2010 – 15.80
2009 – 16.16
2008 – 16.17
2007 – 16.20
300 meter hurdles
2010 – 47.83
2009 – 48.14
2008 – 48.54
2007 – 48.50
High Jump
2010 – 5’ 2”
2009 – 5’ 2”
2008 – 5’ 0”
2007 – 5’ 0”
Long Jump
2010 – 16’ 9.5”
2009 – 16’ 8”
2008 – 16’ 7”
2007 – 16’ 10”
Triple Jump
2010 – 35’ 0”
2009 – 34’ 11”
2008 – 34’ 8.5”
2007 – 35’ 0”
Pole Vault
2010 – 9’ 0”
2009 – 8’ 6”
2008 – 8’ 6”
2007 – 8’ 6”
Shot Put
2010 – 34’ 9.5”
2009 – 34’ 0”
2008 – 33’ 8.5”
2007 – 34’ 2”
Discus
2010 – 102’ 9”
2009 – 101’ 0”
2008 – 102’ 2”
2007 – 104’ 0”
4x100 meter relay
2010 – 50.84
2009 – 50.97
2008 – 51.03
2007 – 51.08
4x200 meter relay
2010 – 1:46.53
2009 – 1:48.47
2008 – 1:47.30
2007 – 1:47.95
4x400 meter relay
2010 – 4:12.23
2009 – 4:14.02
2008 – 4:15.43
2007 – 4:15.00
4x800 meter relay
2010 – 10:19.74
2009 – 10:20.24
2008 – 10:18.42
2007 – 10:23.80