*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19851
19860
19870
19880
19890
19900
19911
19920
19930
19940
19950
19960
19970
19987
19990
20000
20010
20020
20030
20040
20050
20060
20071
20081
20090
20101
20112
20121
20139
20143
20152
20164
20172
20183
20191
20200
20211
20221
20230
20240
Total42