*Excludes Observations that spanned multiple years

Pre 19707
19700
19711
19720
19730
19740
19750
19760
19770
19783
19790
19800
19810
19822
19830
19840
19850
19860
19870
19885
19890
19900
19910
19920
19930
19940
19950
19961
19970
19980
19990
20001
20010
20020
20030
20040
20050
20060
20071
20080
20090
20100
20110
20120
20138
20140
20150
20163
20170
20184
20194
20208
20211
20221
20230
20240
Total50