*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19733
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19970
19983
19990
20000
20011
20020
20030
20040
20051
20060
20070
200813
20091
201010
201166
201216
201310
201427
20152
201649
201716
20182
201918
202021
202123
202228
202335
20242
Total347