year

2003

2004

2005

2006

2007

2008

2009

2010

2011

2016

2017

total

mean

east

1

4

8

15

25

25

28

52

60

41

55

314

28.545454

Central

-

-

-

-

2

2

2

3

2

2

3

16

2.2857142

west

1

3

3

3

4

2

2

3

4

5

10

40

3.6363636

northeast

-

-

-

-

-

-

-

2

1

-

1

4

1.3333333

total

2

7

11

18

31

29

32

60

67

48

69

374

35.800865