*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19802
19810
19820
19830
19840
19851
19860
19870
19882
19891
19906
19912
19922
19936
19943
19954
19961
19972
19980
199911
20007
20019
20020
20031
20041
20051
20060
20071
20089
20091
20100
20112
20120
20130
20143
20150
20160
20173
20181
20190
20202
20212
20223
20230
20240
Total90