*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19851
19860
19870
19886
19890
19903
19911
19928
19931
19943
19955
19961
19974
19980
19990
20000
20010
20022
20030
20040
20050
20061
20071
20085
20094
20102
20113
20125
20131
20143
20151
20165
20172
20187
20190
Total76