*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
197242
197311
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19844
19853
19863
198740
198876
198930
199052
199170
199254
199344
199423
199595
19967
199735
199843
199935
200016
200141
200222
200313
200428
200555
200621
200720
200823
200921
201016
201121
201221
201325
201427
201525
201622
201722
20181
20190
Total1110