*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19743
19751
19760
19772
19783
19791
19803
19813
19822
19834
19842
19851
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19970
19980
19991
20000
20010
20020
20030
20040
20050
20060
20070
20080
20090
20104
20112
20120
20131
20140
20150
20160
20170
20180
20190
20200
Total34