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*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19760
19770
19780
19790
19800
19810
19820
19830
19841
19851
19860
19870
19885
19891
19901
19910
19921
199316
19943
199518
19967
199710
19980
19991
20000
20010
20023
200313
200418
200511
20067
20075
200811
20096
201015
20117
201211
201318
201414
201514
201613
20176
20186
20196
20200
20213
20221
20230
20240
Total254