Table:
year reported by police
young women and girls
adult women
male and female victims overall

north
south
gap in rate
north
south
gap in rate
north
south
gap in rate

rate per 100,000
rate per 100,000
rate per 100,000

2009
3,998
1,514
2.6
2,465
915
2.7
2,620
1,099
2.4

2010
4,170
1,515
2.8
2,564
910
2.8
2,680
1,077
2.5

2011
3,957
1,415
2.8
2,357
846
2.8
2,528
1,003
2.5

2012
3,797
1,346
2.8
2,348
815
2.9
2,521
959
2.6

2013
3,520
1,224
2.9
2,250
767
2.9
2,328
879
2.6

2014
3,380
1,131
3.0
2,230
736
3.0
2,260
832
2.7

2015
3,377
1,147
2.9
2,280
755
3.0
2,304
847
2.7

2016
3,458
1,167
3.0
2,388
754
3.2
2,351
847
2.8

2017
3,561
1,232
2.9
2,462
777
3.2
2,404
870
2.8

average rate
3,691
1,299
2.8
2,372
808
2.9
2,444
935
2.6

percent change in rate
-11
-19
..
-0.1
-15
..
-8
-21
..

Statement: while overall rates of violent crime against young females saw a net decline from 2009 to 2017, the decrease was smaller for young females in the north.
Question: while overall rates of violent crime against young females saw a net decline from 2009 to 2017, what was the decrease for young females in the north?
Answer: [-11.0]