*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19871
19882
19892
19902
19913
19923
19933
19943
19953
19963
19973
19983
19994
20003
20015
20023
20034
20042
20052
20062
20076
20082
20094
20102
20114
20123
20132
20143
20155
20166
20177
20186
20195
20207
20218
20222
20230
20240
Total128