Month

Classes

Class I

Class II

Class III

Total number of events

20010401 20010501 20010601 20010901 20011201 20020401 20020801 20021101 20021201 20030101 20030401 20030501 20030601 20030701 20030801 20030901 20031201 20040101 20040401 20040801 20040901 20041101 20050401 20050501 20050601 20050701 20050801 20060101 20061101 20061201 20070101 20070401 20070601 20070701 20070801 20070901 20071201 20080101 20080401 20080601 20080701 20080801

2 0 0 0 0 1

6 1 0 0 1 0 4 2 0 0 0 1 2 0 0 1 0 1 1 7 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0

7 1 1 5 1 0

7 0 0 0 0 0 2 1 0 0 0 0 0 1 0 1 0 0 0 2 1 0 0 0 0 0 3 0 0 0 0 0 0 0 0 0

3 0 3 3 1 1

9 1 1 0 1 1 7 0 1 0 0 0 2 3 0 0 0 3 2 2 1 0 1 1 0 0 2 0 0 0 0 0 0 0 0 0

12 1

4 8

2 2 22 2 1 0 2 1 13 3 1 0 0 1

4 4

0 2 0 4

3 11 3 0 1 2 0 0 5 0 0 0 0 0 0 0 0 0