*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19760
19770
19782
19792
19800
19812
19823
19833
19842
19851
19861
19872
19880
19890
19900
19911
19925
19934
19942
19952
19963
19972
19980
19992
20001
20012
20021
20030
20040
20050
20063
20070
20080
20090
20102
20116
20120
20131
20142
20152
20166
20173
20187
20194
20200
20210
20220
Total80