*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197251
19739
19740
19751
19760
19770
19780
19790
19801
19810
19820
19831
198440
198527
198682
198775
198882
198947
199064
199194
199247
199317
199413
199523
199624
199720
199818
199968
200070
20012
200215
20033
20048
20053
20066
20074
20084
20091
20105
20118
20122
20133
20143
20151
201612
20175
20180
20190
Total959