*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19853
19860
19870
19880
19890
19903
19910
19920
19933
19949
19950
19961
19975
19981
19993
20000
20010
20020
20033
20043
20050
20060
20070
20082
20090
20102
20110
20128
201320
20141
20150
20162
20172
20183
20191
20200
20211
20220
20233
20240
Total80