*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19752
19760
19770
19781
19791
19802
19810
19820
19831
19840
19851
19860
19874
19880
19890
19900
19910
19920
19932
19943
19950
19960
19972
19980
199944
20000
20010
20020
20030
20040
20050
20060
20070
20080
20090
20104
20111
20120
20131
20140
20150
20163
20171
20187
20192
20200
20210
20220
Total82