*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19721
19731
19740
19750
19760
19770
19781
19790
19800
19811
19820
19832
19842
198523
19864
198734
198843
198919
199015
199121
199214
199321
19943
19952
19961
19978
19981
19993
200013
20011
20020
20030
20040
20051
20061
20071
20080
20094
20100
20111
20120
20130
20141
20150
20166
201710
20180
20190
Total260