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*Excludes Observations that spanned multiple years

Pre 19700
19700
19713
197287
197323
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
198613
19879
198835
19896
199016
199147
199230
199329
19943
199538
199626
199739
19980
199914
20003
200111
200210
20030
20047
20050
20060
20070
20083
20093
20101
20114
20122
20131
20140
20152
20160
20170
20181
20192
20200
20210
Total468